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HAL Id: tel-03615102 https://tel.archives-ouvertes.fr/tel-03615102 Submitted on 21 Mar 2022 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Designing a community intervention for tuberculosis household child contact management and assessing the feasibility of its evaluation in Cameroon and Uganda Anca Vasiliu To cite this version: Anca Vasiliu. Designing a community intervention for tuberculosis household child contact manage- ment and assessing the feasibility of its evaluation in Cameroon and Uganda. Human health and pathology. Université Montpellier, 2021. English. NNT : 2021MONTT078. tel-03615102
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Page 1: Designing a community intervention for tuberculosis ...

HAL Id: tel-03615102https://tel.archives-ouvertes.fr/tel-03615102

Submitted on 21 Mar 2022

HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, estdestinée au dépôt et à la diffusion de documentsscientifiques de niveau recherche, publiés ou non,émanant des établissements d’enseignement et derecherche français ou étrangers, des laboratoirespublics ou privés.

Designing a community intervention for tuberculosishousehold child contact management and assessing thefeasibility of its evaluation in Cameroon and Uganda

Anca Vasiliu

To cite this version:Anca Vasiliu. Designing a community intervention for tuberculosis household child contact manage-ment and assessing the feasibility of its evaluation in Cameroon and Uganda. Human health andpathology. Université Montpellier, 2021. English. �NNT : 2021MONTT078�. �tel-03615102�

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THÈSE POUR OBTENIR LE GRADE DE DOCTEUR

DE L’UNIVERSITÉ DE MONTPELLIER

En Biologie de la Santé

École doctorale CBS2

Unité de recherche UMI 233 TransVIHMI

Designing a community intervention for tuberculosis household child contact management and assessing the

feasibility of its evaluation in Cameroon and Uganda

Présentée par Anca VASILIULe 08 décembre 2021

Sous la direction du Dr Maryline Bonnet

Devant le jury composé de

Pr Christian Lienhardt

Pr Albert Faye

Dr Yap Boum II

Dr Joanna Orne Gliemann

Dr Maryline Bonnet

Membre du jury

Rapporteur

Rapporteur

Membre du jury

Directeur de thèse

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STUDY PROTOCOL Open Access

Community intervention for childtuberculosis active contact investigationand management: study protocol for aparallel cluster randomized controlled trialAnca Vasiliu1, Sabrina Eymard-Duvernay1, Boris Tchounga2, Daniel Atwine3, Elisabete de Carvalho1,

Sayouba Ouedraogo1, Michael Kakinda4, Patrice Tchendjou2, Stavia Turyahabwe5, Albert Kuate Kuate6,

Georges Tiendrebeogo1, Peter J. Dodd7, Stephen M. Graham8,9, Jennifer Cohn10, Martina Casenghi10 and

Maryline Bonnet1*

Abstract

Background: There are major gaps in the management of pediatric tuberculosis (TB) contact investigation for rapid

identification of active tuberculosis and initiation of preventive therapy. This study aims to evaluate the impact of a

community-based intervention as compared to facility-based model for the management of children in contact

with bacteriologically confirmed pulmonary TB adults in low-resource high-burden settings.

Methods/design: This multicenter parallel open-label cluster randomized controlled trial is composed of three

phases: I, baseline phase in which retrospective data are collected, quality of data recording in facility registers is

checked, and expected acceptability and feasibility of the intervention is assessed; II, intervention phase with

enrolment of index cases and contact cases in either facility- or community-based models; and III, explanatory

phase including endpoint data analysis, cost-effectiveness analysis, and post-intervention acceptability assessment

by healthcare providers and beneficiaries. The study uses both quantitative and qualitative analysis methods. The

community-based intervention includes identification and screening of all household contacts, referral of contacts

with TB-suggestive symptoms to the facility for investigation, and household initiation of preventive therapy with

follow-up of eligible child contacts by community healthcare workers, i.e., all young (< 5 years) child contacts or

older (5–14 years) child contacts living with HIV, and with no evidence of TB disease. Twenty clusters representing

TB diagnostic and treatment facilities with their catchment areas are randomized in a 1:1 ratio to either the

community-based intervention arm or the facility-based standard of care arm in Cameroon and Uganda.

Randomization was stratified by country and constrained on the number of index cases per cluster. The primary

endpoint is the proportion of eligible child contacts who initiate and complete the preventive therapy. The sample

size is of 1500 child contacts to identify a 10% difference between the arms with the assumption that 60% of

children will complete the preventive therapy in the standard of care arm.

(Continued on next page)

© The Author(s). 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License,which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you giveappropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate ifchanges were made. The images or other third party material in this article are included in the article's Creative Commonslicence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commonslicence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtainpermission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to thedata made available in this article, unless otherwise stated in a credit line to the data.

* Correspondence: [email protected] National Research Institute for Sustainable Development (IRD UMI

233 TransVIHMI- UM-INSERM U1175), Montpellier, France

Full list of author information is available at the end of the article

Vasiliu et al. Trials (2021) 22:180

https://doi.org/10.1186/s13063-021-05124-9

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(Continued from previous page)

Discussion: This study will provide evidence of the impact of a community-based intervention on household child

contact screening and management of TB preventive therapy in order to improve care and prevention of

childhood TB in low-resource high-burden settings.

Trial registration: ClinicalTrials.gov NCT03832023. Registered on 6 February 2019

Keywords: Contact tracing, Preventive therapy, Pediatric tuberculosis, Community intervention, Tuberculosis

symptom screening, Cluster randomized controlled trial

BackgroundTuberculosis (TB) is an infectious disease causing inci-

dent cases of disease in around 10 million people world-

wide in 2018 [1]. The World Health Organization

(WHO) estimated that 11% of the TB cases in 2018 were

in children (< 15 years). However, a modeling study has

estimated that the pediatric caseload in high-burden

countries is as high as 15–20% of all TB cases [2]. The

mortality rate in undetected untreated children is esti-

mated to be 21.9% for children of all ages and rises to

43.6% in young children of less than 5 years [3]. Improv-

ing case detection and treatment of this high-risk group

of young children is particularly challenging due to diag-

nostic limitations and clinical overlap with other com-

mon severe diseases of infants and young children in

resource-limited settings.

Research has consistently shown that TB disease in

young children usually occurs soon after exposure

and infection, that the risk of disease if infected is

high, and that TB preventive therapy (TPT) can sig-

nificantly reduce the risk of disease following expos-

ure and infection [4]. A meta-analysis reported that

10% of young child contacts had TB disease at the

time of screening, and 35% had evidence of infection

[5]. A recent individualized participant meta-analysis

found that the effectiveness of tuberculosis prevent-

ive treatment (TPT) was 63% (95% CI 53–70%)

among all exposed children and 85% (95% CI 80–

89%) among those with evidence of infection [4].

Therefore, the rapid identification and management

of exposed children in the households of TB disease

cases is a critical opportunity to detect, treat, and

prevent TB. Although recommended for decades,

household child contact screening and TPT have

been poorly implemented in high-burden and

resource-limited countries. For many years, children

were considered lower priority due to being less in-

fectious and therefore contributing less to TB trans-

mission than adults [6].

The WHO End TB Strategy and ambitious targets

for coverage of screening and TPT in the Global

Plan to End TB demonstrate political will and pro-

vide renewed opportunity to close the wide policy-

practice gap [7, 8]. The policy-practice gaps observed

in the screening and management of child contacts

are driven by health system and human resource

challenges as well as the many challenges faced by

families in bringing their children to the health facil-

ity [9–13]. In most low-resource countries, the index

case is asked to bring all child contacts to the health

facility for TB screening, and yet many barriers arise

when applying this recommendation such as schedul-

ing or financial challenges, transport costs, long

waiting periods in settings with risks of further ex-

posure, and families or even healthcare workers’ re-

luctance to apply these guidelines as they do not

always understand the rationale, potential benefits,

or risks when the child is well [13–17]. Community-

based household contact screening of children in the

household is likely to improve TB disease case de-

tection [8, 18–20].

The use of classical tuberculin skin test (TST) to iden-

tify child contact with TB infection who will benefit

from the TPT and the need of chest radiography (CXR)

in addition to symptom screening to exclude TB disease

before initiation of TPT have both operational challenge

that contributes to the lost proportion of child contacts

initiated on TPT for a long time [13]. However, there is

evidence that the additional yield of TB disease detection

from CXR in asymptomatic child contacts is extremely

low [9, 21–23]. In addition, WHO has recommended

since 2006 that high-risk child TB contacts—young (< 5

years) or are living with human immunodeficiency virus

(HIV) of any age—receive TPT after exclusion of TB dis-

ease without systematically confirming TB infection with

TST [24, 25]. Therefore, a symptom-based approach that

does not require further investigations for asymptomatic

child contacts could facilitate a more decentralized,

community-based implementation to initiate TPT in

asymptomatic children [8]. In addition, the recent WHO

recommendations [6] that include shorter TPT combin-

ation regimens (isoniazid and rifampicin or rifapentine

for 3 months) are associated with improved adherence

compared to the standard TPT regimen of isoniazid

monotherapy for at least 6 months and provide an im-

portant opportunity for increasing completion of TPT

[9, 26, 27]. Further, follow-up of children receiving TPT

at the household could further improve TPT completion

Vasiliu et al. Trials (2021) 22:180 Page 2 of 15

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rates and could be easily integrated with activities to

support treatment of TB disease of the index cases in

the household.

There is no published study that has evaluated the im-

pact on the cascade of care of pediatric TB case detec-

tion and preventive therapy management of a

community-based approach compared to a facility-based

standard of care. We therefore aim to evaluate the im-

plementation of a community-based approach to child

TB contact screening and management in two TB-

endemic African countries.

MethodsStudy objective and endpoints

The primary objective of this study is to compare the

proportion of household child TB contacts eligible for

TPT who initiate and complete TPT under a facility-

based standard of care and under a decentralized

community-based intervention model of care for contact

screening and management.

The corresponding primary endpoint is the proportion

of child TB contacts < 5 years of age and HIV-infected

children of 5–14 years of age who are declared by the

index case and who initiate and complete the TPT.

The secondary objectives compare the aforementioned

models in terms of (i) cascade of care of TPT initiation

and completion in child contacts < 5 years or HIV-

positive children 5–14 years; (ii) cascade of care for TB

detection and treatment in all included contacts; (iii) tol-

erability and adherence in children initiated on TPT; (iv)

acceptability and feasibility of the two models by the

parents/guardians, health personnel, and community; (v)

the effect of the community-based intervention on the

number of adult contacts diagnosed with TB; and the

cost-effectiveness. The number of children and adults di-

agnosed with TB and the number of children initiated

on TPT will be also compared before and after the

intervention.

The secondary endpoints of the study are presented in

Table 1.

Study design

This is a two-arm parallel cluster randomized study

comparing two models of care for TB contact investiga-

tion and management. This study contains three phases:

1. Baseline phase (phase I) in which retrospective data

collection and register quality checks were done in

order to assess if the facility registers could be a

reliable source of documents for the study. During

this phase, there was also a baseline qualitative

assessment with adult TB patients who are parents

and stakeholders to better prepare the intervention

phase and assess the acceptability and feasibility of

the proposed activities.

2. Intervention phase (phase II) includes

implementation and participant recruitment in the

two models of care and study data collection.

3. Explanatory phase (phase III) contains the endpoint

analysis and reporting, a cost-effectiveness analysis,

and a post-intervention qualitative assessment with

adult TB patients who are parents and cluster stake-

holders to collect the acceptability of the imple-

mented package.

This research is known under the name of CONTACT

study (Community Intervention for Tuberculosis Active

Contact Tracing and Preventive Therapy) and represents

a research project embedded in a multi-country pediatric

TB implementation program called Catalyzing Pediatric

TB Innovations (CaP TB) led by the Elizabeth Glaser

Pediatric AIDS Foundation (EGPAF) and funded by

Unitaid.

Study setting

This study is conducted in two high TB incidence,

resource-limited African countries: Cameroon located

in West Africa and Uganda in East Africa, with im-

portant differences in programmatic delivery of TB

services. In Cameroon, TB care and management is

centralized. Only secondary-level health facilities have

TB laboratory diagnostic facilities and TB patients

can only access care and drugs from these health fa-

cilities. In Uganda, TB management is decentralized

to the primary healthcare level. In both countries, na-

tional guidelines [28, 29] at the time of this study de-

velopment recommended contact investigation and

screening as well as TPT with 6 months of daily iso-

niazid (6H) for eligible children. However, coverage of

TPT for eligible children below 5 years is low in both

countries. WHO recently reported that only 24% and

15% of eligible children were initiated on TPT in

2018 in Cameroon and Uganda respectively [1].

Description of the intervention

Facility-based model

This model implements a “passive” approach to the

screening and management of household contacts (see

definition in the “Study population” section) at the facil-

ity level as per current practice. Implementation follows

current National Tuberculosis Program (NTP) recom-

mendations, except that a 3-month regimen of daily

rifampicin-isoniazid (3RH) as a fixed-dose combination

(FDC) is offered as TPT to eligible child contacts. In the

context of the study, sites also benefit from additional

data collection and trainings with follow-up support for

the facility staff.

Vasiliu et al. Trials (2021) 22:180 Page 3 of 15

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Table 1 Secondary endpoints of the CONTACT study

General secondary endpoints Detailed secondary endpoints

Cascade of care for the initiation and completion of TPT of child contacts < 5 years or HIV-infected 5–14 years and reasons of dropouts at different steps of the cascade

Number of screened children and proportion of children screened among child contacts < 5years or HIV-infected 5–14 years declared by the index case

Proportion of children potentially eligible for TPT: TB disease excluded

Proportion of children eligible for TPT after exclusion of contraindication to TPT

Proportion of children started on TPT among those eligible for TPT

Proportion of children who did not complete TPT among those started on TPT and reasons ofinterruptions

Cascade of care for TB detection of child contacts Proportion of children with symptoms suggestive of TB: presumptive TB

Proportion of presumptive TB cases investigated for TB

Proportion of children diagnosed with TB

Proportion of children with TB diagnosis who are started on TB treatment

Cascade of care for TB detection of adult contacts Number of adults screened and proportion of adults screened among household identifiedadult contacts

Proportion of adults with symptoms suggestive of TB: presumptive TB cases

Proportion of adults presumptive TB cases diagnosed with TB

Safety and treatment adherence for children under TPT Proportion of children with serious adverse events

Proportion of children with adverse events of interest: peripheral neuropathy, clinicalhepatotoxicity

Ratio of dose taken as indicated (ticked) on the treatment card by the parent/guardian overthe total number of doses to be taken by prescription

Endpoints at 6 months Treatment outcomes of children started on TB treatment

Proportion of children diagnosed with TB after initiation of TPT: during and after TPT

Proportion of children diagnosed with TB among those who were not started on TPT andwere not diagnosed with TB at baseline assessment

Before-after comparison for TB adult and pediatric cases and for TPT initiation and completion fromhealth facility registers

Number of patients diagnosed with TB and registered

Proportion of children among all patients diagnosed with TB and registered

TB treatment outcomes of patients (adults and children) diagnosed with TB and registered

Number of children started on TPT

Completion rate of children started on TPT

Acceptability and feasibility of the intervention Attitudes, willingness, and motivation to have a visit in their household

Myths, anticipated fears, stigma, and risks of having a visit in their household

Actual experiences with household visits

Perception of the disease, its risk, and the notion of prevention, including TPT

Description of critical events during house visits and how these were dealt with

Identification of main constraints

Vasiliu

etal.Tria

ls (2

02

1) 2

2:1

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Table 1 Secondary endpoints of the CONTACT study (Continued)

General secondary endpoints Detailed secondary endpoints

Fidelity of the study Proportion of delivered activities compared to the intended activities of the model

Cost-effectiveness of the intervention Costs of CHW/community nurse assessment and treatment

Costs of facility-based assessment and treatment

Other facility costs (overheads, diagnosis, hospitalizations)

Direct parent/guardian costs (related to care)

Indirect parent/guardian costs (unrelated to care, e.g., dissaving, travel costs)

Vasiliu

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1) 2

2:1

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When a person is diagnosed with bacteriologically

confirmed pulmonary TB (index case), the facility staff

in charge of TB (TB focal person) asks the index case to

bring all household contacts with TB-related symptoms,

all young (< 5 years) child contacts or older (5–14 years)

child contacts living with HIV or exposed to HIV, irre-

spective of symptoms, to the health facility for evaluation

for TB disease or for eligibility for TPT. This facility-

based model is currently implemented in district hospi-

tals in Cameroon for child contacts under 5 years old,

but poorly applied for child contacts 5–14 living with

HIV. In Uganda, the NTP allows household contact tra-

cing when feasible but evaluation, TPT initiation, and

follow-up are required to be done at the facility. In prac-

tice, due to lack of transport, the household contact tra-

cing was poorly implemented. In both countries, at

facility, TB investigations include clinical examination,

sample collection for smear microscopy or Xpert MTB/

RIF testing, and CXR when available and indicated, i.e.,

Xpert is negative or not done. Any contact diagnosed

with TB is commenced on TB treatment, registered, and

provided with treatment support and follow-up as per

NTP guidelines. All sites are supported by the CaP TB

program reducing the risk of heterogeneity of diagnosis

and treatment of pediatric TB between sites and the two

countries. Asymptomatic children who are eligible to re-

ceive TPT as 3RH (or 6H if drug-drug interactions with

antiretroviral therapy preclude the use of rifampicin) are

initiated at the facility with monthly follow-up (Fig. 1).

The schedule of the facility-based model is presented in

Table 2.

Community-based model

The intervention model is a decentralized, “active” ap-

proach to the screening and management of household

contacts and is community-based. When an index case

is diagnosed with bacteriologically confirmed pulmonary

TB, the TB focal person asks whether s/he has child

contacts in the household, and if so, then asks whether

s/he is willing to receive a team in his/her household for

contact symptom screening. If they agree, then an ap-

pointment is made and a team comprising a trained

community health worker (CHW) and a research assist-

ant goes in the household to screen all contacts (chil-

dren and adults). If the index case does not have contact

children in their household, then s/he is not included in

the study, but contact investigation is done under rou-

tine care by the TB focal person. During the contact

screening visit, the contacts who present symptoms of

TB are referred to the health facility for TB investiga-

tions. Those who are asymptomatic and eligible for TPT

(i.e., < 5 years irrespective of HIV status or 5–14 years

and living with HIV) receive another visit by the TB

focal person or TB nurse to initiate 3RH (or 6H if drug-

drug interactions with antiretroviral therapy preclude

the use of rifampicin). The follow-up is done at the

household by the CHW after 1 week, 2 weeks, and then

monthly in order to rapidly identify the children who de-

velop TB symptoms in the community. The CHW col-

lects the TPT at the health facility before each

household visit and brings the remaining pills and docu-

ments back to the facility after the visit. During the

follow-up visits, the CHW repeats the TB symptom

screening, assesses the child’s TPT tolerability and ad-

herence, and assesses the presence of any critical sign. If

the child presents critical danger signs, tolerability prob-

lems, or TB symptoms, s/he is immediately referred to

the health facility for a clinician to consult them (Fig. 2).

The schedule of the community-based model is pre-

sented in Table 2.

Fig. 1 Facility-based model flowchart

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Table 2 SPIRIT study schedule

Baseline phase Intervention phase Evaluationphase

Allocation* Siteassessment**

Enrolment ofindex cases

Enrolment ofcontact cases

Follow-up End ofstudy

Timepoint -2W 0 W1 W2 W4 W8 W12*** W24

Enrolment

Eligibility screen X X

Informed consent X X

Allocation X

Interventions

Facility-based arm X X X X X X

Community-basedarm

X X X X X X X X

Qualitativeassessment

X X

CEA X

Assessments

Identification ofcontact children

X

Children started onTPT

X

Children completedTPT

X X

Acceptability of theintervention

X X

TPT cost X

Abbreviations: W week, CEA cost-effectiveness analysis, TPT TB preventive therapy

*Allocation takes place before the intervention begins as the clusters are randomized and not the individuals

**The baseline phase takes place 3 months before the intervention phase

***Children started on 6months of isoniazid have 2 additional follow-up visits at week 16 and week 20

Fig. 2 Community-based model flowchart

Vasiliu et al. Trials (2021) 22:180 Page 7 of 15

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Study population

Bacteriologically confirmed (by smear microscopy, Xpert

MTB/RIF, or TB loop-mediated isothermal amplification

(TB-LAMP) assays) index cases, > 15 years old who have

been diagnosed less than a month prior to inclusion and

declaring child contacts in the study catchment area, are

eligible. Exclusion criteria are known multi-drug resist-

ance (MDR), the index case being a prisoner, or TB pa-

tients from an already screened household from the

study.

Contacts sharing the same enclosed space for frequent

or extended periods of time with the index case or hav-

ing slept in the same bed during the last 3 months as per

the WHO definition of a contact case [24] are eligible

unless they are already on TPT or on TB treatment.

For the qualitative assessment, the study population is

represented by key informants (facility managers, health

staff, community health workers, and community

leaders) and by male and female TB patients, who are

parents/guardians.

Cluster selection and randomization

The study clusters are health facilities supported by the

CaP TB Program with TB diagnostic and treatment cap-

acity after an initial assessment taking into consideration

the number of bacteriological index cases identified from

January to December 2018 (minimum of 50). Priority

was given to rural, semi-rural, or semi-urban facilities as

there is less population movement than in an urban set-

ting with relatively easy access. In Cameroon, there were

mainly district hospitals because TB diagnosis is mainly

done at the secondary healthcare level, with ten clusters

selected from two regions (Central and Littoral regions).

In Uganda, as TB services are decentralized at the pri-

mary healthcare level, the ten clusters were primary

health centers in four districts in the South West region,

some with two facilities per cluster in order to reach the

minimum of 50 index cases per year.

The randomization was stratified by country, and in

each country, the 10 clusters have been allocated to one

of the study models by a covariate-constrained

randomization [30] taking into account the number of

bacteriologically confirmed TB cases from that cluster

the previous year. The randomization was performed by

a statistician from the central research team 3months

prior to the start of inclusions. Participants, healthcare

providers, study staff, and investigators are not blinded

to the allocation of the health facilities.

The cluster list can be found in the Supplementary

Material.

Criteria to discontinue the allocated intervention to a

cluster are the absence of recruitment in a cluster for

more than 2months or if the NTP proposes a similar

intervention that would bias the outcomes of the study.

TPT

The 3RH regimen uses the child-friendly formulation of

rifampicin (R) 75 mg/isoniazid (H) 50mg as a FDC [31]

for eligible child contacts of < 25 kg. This formulation is

procured and provided by the CaP TB project, as the

NTP has not yet recommended this regimen, but has ap-

proved its use in the context of the study. Prescription is

based on the body weight dose range as recommended

by WHO [32]. The body weight is measured at the TPT

initiation visit and at the TPT outcome visit for both

models, and in the facility-based model, it is measured at

every follow-up visit. For children of 25 kg or more, the

adult RH tablet is be provided. For children receiving an

antiretroviral treatment with protease inhibitors (as lopi-

navir/ritonavir), nevirapine or dolutegravir, 6H is used to

avoid the drug-drug interaction between R and these

antiretrovirals. Along with the TPT, 10 mg of daily pyri-

doxine (vitamin B6) is given to each child to prevent

peripheral neuropathy.

Study procedures

Symptom screening

Both models use the following symptoms [33] to assess

if the contact child has presumptive TB or not:

� Persistent non-remittent cough > 2 weeks

� Reported persistent fever > 10 days

� Reduced playfulness/lethargy/fatigue

� Wheezing > 2 weeks

� Night sweats > 2 weeks

� Documented or reported weight loss, loss of

appetite, or no weight gain (failure to thrive) in the

last month

� Malnourishment using Mid-Upper Arm Circumfer-

ence below 125 mm in children 6 months–5 years

old

The presence of at least one of these symptoms re-

quires TB investigations at the health facility.

For HIV-positive children, symptoms of any duration

are suggestive of TB and the child is immediately re-

ferred to the clinic. HIV testing is proposed for 5–14-

year-old children with unknown status using two rapid

tests, as per national HIV testing guidance. In the com-

munity model, the first test is done in the household

and if positive, the confirmation test is done at the

health facility as per national guidance.

In case a child presents a sign that is not yet suggestive

of TB due to its duration (ex: cough for less than 2

weeks), the screening is repeated after 2 weeks’ time.

In addition to the screening for TB symptoms, CHWs

have been trained to identify critical signs for urgent re-

ferral in case the child needs to be seen urgently by a

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clinician. These signs are recommended by the Inte-

grated Management of Childhood Illness Handbook of

the WHO [34] and include lethargy or unconsciousness,

chest indrawing, difficulty breathing, sunken eyes, drink-

ing poorly or not drinking, seizures, severe wasting, se-

vere pallor, and edema of both feet.

Adherence assessment

The adherence is assessed at each follow-up visit in both

models of care using specific questions on how many

doses were missed in the last 4 days, by counting the

number of doses taken reported by the parent/guardian

in a TPT treatment card introduced by the study and by

verifying empty drug blister packs. Parent/guardian re-

ceived treatment adherence counseling at TPT initiation

and during follow-up based on treatment adherence.

Safety assessment

At each follow-up visit, the children are assessed for

TPT tolerability by CHW using a standard check list of

signs suggestive of hepatitis, peripheral neuropathy, and

rash that are classically associated with HR (nausea, loss

of appetite, vomiting, jaundice, dizziness, tingling, or

burning sensation in the extremities). In every cluster fa-

cility, a clinician was trained to act as a safety monitor

and examine children with problems of tolerability iden-

tified by the CHW. In case of serious adverse events, the

safety monitor immediately notifies the event to the

country principal investigator who informs the sponsor

and the ethics committee of the respective country. All

adverse events and serious adverse events are coded

using the Medical Dictionary for Regulatory Activities

(MedDRA) dictionary (version 22.1, September 2019).

On a 6-month basis, a safety data review is done by the

study management team that is then reported to the

sponsor and scientific advisory committee.

Sample size calculation

For the sample size calculation, we used an estimated

60% completion rate among the eligible children in the

facility-based arm based on a recent systematic review

[35] and a 10% difference in the community-based arm,

considered to be the minimal clinically relevant differ-

ence. We considered a cluster coefficient variability of

50% based on the variation in the number of bacterio-

logically confirmed index cases between the 20 clusters

in the year prior to the intervention. An intra-cluster

correlation of 0.01 was used. With these parameters, we

would need to include at least 1500 declared child con-

tacts by the index case who would be eligible to the TPT

to have a power of 85%. With a minimum of 1500 en-

rolled child contacts, we could maintain at least 80% of

power to detect a difference of 10% in the primary out-

come between the two arms assuming the proportion

with the primary outcome in the control arm ranges

from 60 to 70% and of the cluster coefficient variability

varies from 50 to 70%. The type I error rate α is conven-

tionally fixed at 0.05%. Based on national household sta-

tistics per country [36–38], we make the hypothesis of

one child under 5 years per household. Looking at the

index case TB registrations in the year prior to the inter-

vention, we estimate that it would be possible to include

1500 contact children in a 15-month period. Research

assistants in each cluster supervised that all bacterio-

logically confirmed index cases registered in the NTP

treatment register were screened for study eligibility to

achieve adequate participant enrolment to reach sample

size.

Data collection

Mixed methods of data collection, quantitative and

qualitative, are used. There were no specific plans to

promote participant retention to avoid biasing the trial

outcomes that the cascade of cares for contact screening

and management. The study reimburses participant’s

transportation in case for safety reasons only.

Quantitative data

Other than the facility registers, study-specific source

documents are used. The data for the primary and sec-

ondary objectives are collected by the TB focal person in

the health facilities and community health workers in

the community. There is one research assistant assigned

to each cluster health facility who enters data onto tab-

lets using the Research Electronic Data Capture (RED-

Cap) mobile application version 4.9.1, 6 February 2020.

Patients’ cost data are collected by research assistants in

the REDCap mobile application using an adapted version

of the patient cost tool developed by the WHO [39]. At

the health system level, data are collected through litera-

ture, source documents from the Ministry of Health, pri-

mary expenditure analysis, and procurement records by

the cost analysis researchers.

Qualitative data

The data for the qualitative assessment is collected by

the social researchers through in-depth interviews and

focus group discussions in English, French, or local lan-

guage with the help of a local qualitative research assist-

ant. Participants’ confidentiality and privacy are

respected throughout the study. During the baseline

phase of the study, a qualitative assessment of social de-

terminants has been performed to identify the percep-

tions of TB, prevention for child contacts, and obstacles

for treatment, acceptability, and feasibility of the pro-

posed intervention. Focus group discussions have been

organized with TB patients and in-depth interviews have

been conducted with health staff, facility managers,

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CHW, and community leaders. During the implementa-

tion phase, data on concurrent acceptability is assessed

through periodic supervision meetings of the CHW. A

second qualitative assessment will be performed at the

end of the intervention focusing on the acceptability and

lessons learned. These activities are planned in both

models of care implemented in the study.

Process data

In the baseline phase, sites were assessed in terms of

quality of data collection in the registers and specific

practices that would require adjustments for study

organization of those sites. During the implementation

phase, recruitment logs are filled in by research assis-

tants to document study screening and enrolment

process with reasons of refusal.

Data management

A central data manager coordinates with local data man-

agers to ensure the data entry and verification according

to a Data Management Plan. There are three levels of

data checking and quality control: at data entry using re-

stricted value set or compulsory fields, at country-level

data management running weekly checks, and at

central-level data management with a monthly

consistency data check. The collected data is anon-

ymized by the use of unique study identification num-

bers and followed by the investigators through a

dashboard system developed at the central level. The

tablets used for the study are password-protected and

have an individual identification for each research assist-

ant. The tablet data is encrypted when sent to the server.

The study database is on a web-based platform provided

by REDCap [40, 41], protected by password, encrypted,

and hosted at the Institut de Recherche pour le Develop-

ment in Montpellier, France. The back-up of the data-

base is done on a daily basis on the server of the Institut

de Recherche pour le Development in Montpellier.

Quality management

Each country research team is composed of one study

coordinator, one clinical research assistant, and 8 re-

search assistants. All staff is trained on good clinical

practices, protocol, and study standard operating proce-

dures. Training of the country research teams took place

before the baseline phase and was done by the central

research team. CHW were selected based on criteria re-

garding their education, experience with community ac-

tivities, and acceptability by the community and capacity

for study activities. The site teams (TB focal person, TB

nurse, CHW, and safety monitor) were trained before

the intervention phase by the country research teams.

Each facility cluster has a clinician safety monitor trained

to consult children with tolerability complaints and

report adverse events. Standard operating procedures,

country-specific manuals of procedures (to take into ac-

count the implementation specificities of each country),

and a quality management plan were developed by the

central research team. Clinical research assistants per-

form internal data monitoring from the eCRF against

source documents on a monthly basis, and central site

monitoring is done every 3–4months. In addition, the

sponsor performs a yearly site monitoring.

The study is overseen by a steering committee involv-

ing all investigators including representatives of the na-

tional TB program with monthly calls to discuss study

inclusions, challenges, and decisions on study implemen-

tation and a scientific advisory committee composed by

experts in the field of pediatric tuberculosis and ran-

domized controlled trials with meeting twice a year to

discuss study progress, challenges, and safety review. A

country community advisory board is constituted to give

guidance on the implementation of the community ac-

tivities and support the study team on patient informa-

tion and communication.

Statistical analysis

Primary analysis

The denominator for the analysis of the primary end-

point is the number of child contacts < 5 years and HIV-

infected 5–14 years declared by the index case at the fa-

cility during the inclusion visit. Since discrepancies can

be expected between what is declared by the index case

and what is observed during contact screening, a sensi-

tivity analysis will be performed using as denominator

the number of children < 5 years of age and HIV-

infected children of 5–14 years of age identified during

the screening. An additional sensitivity analysis will be

performed including only participants that followed all

study procedures (per-protocol approach) among the de-

clared and then enrolled child contacts. Dropping out of

the cascade of cares and potentially being lost to follow-

up can be the consequence of the models of care under

evaluation. Therefore, lost to follow-up will be kept in

the primary outcome analysis. They will be removed

from the sensitivity per-protocol analysis.

A generalized linear mixed model with a binomial dis-

tribution and logit link function will be used to perform

individual-level analysis adjusting for clustering. The re-

gression model will include the fixed effect of treatment

assignation and country and one random-effect for the

cluster. A degree-of-freedom correction will be applied

(between-within method) to deal with the type I error

inflation due to the small number of clusters. The pri-

mary analysis will focus on the difference between the

two study arms adjusted for country, and a secondary

analysis will add an adjustment for unbalanced factors

(urban/rural, district size) identified in the baseline

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assessment. For the analysis of the secondary outcomes,

a similar mixed model will be used with the same ran-

dom effects and correction method, focusing on each

endpoint of the cascade of care for initiation and com-

pletion of TPT and each endpoint of the cascade of care

for TB detection. The same model will be applied for

the sensitivity analyses.

The proportion of children notified in the facility TPT

register among all notified cases during the intervention

period will be compared between the two models of care

and will also be compared with the same proportions be-

fore intervention for the same time period (data col-

lected during the baseline assessment). The proportion

of confirmed TB among all pediatric notified cases and

the proportion of treatment completion will also be

compared between the two models and with the pre-

intervention period.

Qualitative assessment analysis

All transcripts from the in-depth interviews and focus

group discussions are transcribed in French if the activ-

ity was conducted in French and in English if the activity

was conducted in the local language or English. For the

analysis, an interim analysis process will be used. Major

themes from the interviews and focus groups will be

listed according to the objectives of the study before

starting the analyses (a priori codes) and will be enriched

if other themes will be found to be relevant to the study

objectives (inductive codes). The analysis will be done

using the software ATLAS.ti 8 2017.

Cost-effectiveness analysis

The two models of care will be analyzed and their cost-

effectiveness in each country assessed.

The analysis will be from the healthcare system’s and

the primary analysis will generate an incremental cost

per Disability-Adjusted Life Year averted for the inter-

vention model of care vs the standard of care, with a

mathematical model used to extrapolate effects observed

in the trial to a lifetime time horizon. Additional ana-

lyses will include reporting of patient costs incurred dur-

ing illness and care-seeking, and an asset-based wealth

quintile of participants, and generation of additional

measures of health impact (deaths and TB cases

averted).

Ethical aspects

Protocol approval

The study protocol has been submitted and approved by

two central Institutional Review Boards (IRBs): Advarra

IRB from the USA, which is the sponsor’s institutional

IRB, and WHO Ethics Research Committee. In addition,

the protocol was submitted and approved by the local

IRBs: Cameroon National Ethics Committee for Human

Health Research and Research Ethics Committee of the

Mbarara University of Science and Technology in

Uganda. In Cameroon, it has also been approved by the

Direction for Operational Research from the Ministry of

Health and in Uganda by the Ugandan National Council

for Science and Technology. Any change in the protocol

or to the informed consent form that affects the scien-

tific questions and study design or may affect a subject’s

willingness to continue participation in the study were

considered as amendment and are submitted to all pre-

viously described ethics committees after approval from

the scientific committee and the sponsor.

Informed consent

All consent forms used for the CONTACT study have

previously been approved by the central and local ethics

committees. Written informed consent is obtained from

index cases and contacts, who are informed of the study

objectives, procedures, and their risks and benefits. In

addition, children older than 7 years in Cameroon and 8

years in Uganda provide written informed assent. Partic-

ipants with incapacity consent through their legal repre-

sentative and illiterate participants consent through a

witness who is not part of study staff. Country-specific

informed consent forms are developed to allow for dif-

ferent standard of care specificities. For index cases, the

TB focal person collects the informed consent at the in-

clusion visit. For contacts in the facility-based model,

the TB focal person, assisted by the research assistant,

collects the informed consent. In the community-based

model, only the research assistant can collect the in-

formed consent. Consent for HIV testing is included in

the study consent form.

Individual consent is obtained by the researchers dur-

ing qualitative activities: focus group discussions and in-

depth interviews and also during the patient cost collec-

tion for the cost-effectiveness analysis.

Handling withdrawals

At any moment, a contact case can withdraw their con-

sent without any consequence for their care and their

data prior to the date of withdrawal are kept for analysis.

Their case management continues under the NTP

guidelines.

Confidentiality

Each participant has a unique study code. No directly

identifying data is entered into the database. An identifi-

cation log allows the research assistants to make the link

between the code and the name if needed and this log is

kept separately in locked study cabinets on site.

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Dissemination

The trial results will be published in peer-reviewed med-

ical journals, preferably open access or guarantying an

open access according to international guidelines for

authorship. After approval by the scientific committee,

the final trial report will be sent to the sponsor, Unitaid,

the World Health Organization, and NTP officials.

DiscussionThe CONTACT study has several strengths and

limitations.

Strengths

Methodologically, the use of a randomized cluster-

controlled design ensures a good level of evidence. The

inter-cluster variability is taken into consideration by the

use of a covariate-constrained randomization of the

number of index cases per cluster. In addition, the study

is using a comprehensive mixed-methods approach that

looks at the study goal from different perspectives: quan-

titative, qualitative, and cost-effectiveness.

The intervention package was conceptualized in a very

pragmatic and realistic manner after discussion with

end-users, national TB program, and community repre-

sentative to ensure that it could be implemented by the

NTP at the end of the research period. In addition, the

intervention is evaluated in two countries with similar

TB burden, but very different health system organization

and level of community engagement that increases the

representativeness of the study results. In Cameroon, the

national system is very centralized whereas in Uganda

lower level health facilities are capacitated to do TB

diagnosis and follow-up. In Uganda, over the last 2 de-

cades, there have been several HIV-related interventions,

many of which have been implemented in the communi-

ties. The population is used to community activities and

a system of CHW is in place (called Village Health

Teams) and articulated by the Ministry of Health. The

package proposed by the CONTACT study has been in-

spired by the HIV and malaria community activities [42,

43] and integrates very well in the Ugandan context. Fi-

nally, all cluster facilities are supported by the CaP TB

program for TB diagnosis and treatment, which reduces

the risk of heterogeneity between the clusters and TB

detection endpoint assessment bias.

The study is constructed on the framework already ex-

istent in the health facilities and uses the health

personnel of these health facilities. The main strength is

represented by their training and experience in working

with TB, and the fact that they are already integrated in

the national system, no study additional staff was hired

for this purpose. The TB focal person and safety monitor

receive an incentive for filling study-specific documenta-

tion that is outside their usual work.

Limitations

Because the cluster sites were limited to the facilities

supported by the CaP TB project, it was not possible to

select more than 20 clusters. It was impossible to avoid

urban facilities, which increases the inter-cluster vari-

ability and may increase the risk of cluster contamin-

ation due to the more complex system of patients’

reference in cities as compared to rural settings. The

proportion of urban clusters is higher in Cameroon as

the two selected regions where the CaP TB project takes

place include the two biggest cities of the country. In

Uganda, some clusters comprise two health facilities to

allow for the necessary recruitment capacity and this op-

erational limitation may introduce more heterogeneity in

the measurement of the outcomes.

Another limitation is the reliability of source docu-

ments from facility registers as compared to study-

specific source documents, which can induce an infor-

mation bias and risk of missing data. To minimize this

limitation, a register data quality check was done during

the baseline period and in sites where inconsistencies

were found, a training on data collection was

recommended.

The training of facility personnel on the study proce-

dures, the reinforcement of the study source documents,

and the presence of research assistants is likely to in-

crease the quality of the facility-based as compared to

routine conditions and may have an effect on the ex-

pected difference of primary endpoint between the

community-based and the facility-based models. Also,

because the duration of the TPT is known to influence

the completion of the TPT, which is part of the primary

endpoint measure and because NTP was expected to

change their guidelines in the coming months, we intro-

duced the 3-month regimen in the facility-based model

as well. Therefore, the study standard of care does not

fully represent the current standard of care used in both

countries. The choice of a very operational and prag-

matic adherence measure likely to be well accepted by

NTP (recording of the dose intake on a treatment card)

relies on the parent/guardian’s understanding and reli-

ability in recording the dose intake and could potentially

introduce information bias or desirability bias. To pre-

vent this risk, the CHW and research assistants are

asked to systematically reconcile what is recorded by the

parent/guardian on the treatment card with the pills

remaining in the blisters. In the community-based

model, two extra visits after 1 and 2 weeks after starting

TPT were requested by the NTP to ensure that no child

with TB disease was missed by the symptom screening

done by CHW and to verify the tolerability. This results

in more frequent assessments of treatment adherence

and tolerability as compared to the monthly follow-up in

the facility-based model and could introduce an

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observation bias that could affect the comparison of ad-

herence and safety between the two models.

Challenges

This is an implementation research which is highly

dependent on the health system policy and organization.

One of the many challenges to be taken into account is

the change of the country guidelines during the imple-

mentation of the protocol as these changes require most

of the time a protocol amendment with implications on

study procedures and organization. Other challenges are

related to shortages of TB medication, stock-outs of

Xpert MTB/RIF cartridges that affect the identification

of bacteriologically confirmed index cases at facility level

and staff availability or turn over. The 3RH and 6H TPT

drugs were provided by the study to prevent the risk of

shortage. One cluster in Cameroon had to be changed

after approval of the study protocol due to an unantici-

pated concurrent community-based intervention that

could bias the study outcome measure. Additionally, in

both countries, following the request from the NTP that

TPT should be initiated by a nurse, the implementation

of the intervention package could not rely on CHW only

as initially planned and has to involve facility nurses

moving to patients’ household. The same applies to HIV

testing that cannot be done by trained CHW in

Cameroon.

Constant communication with the CaP TB program

team and the NTP team at higher and lower levels is

crucial to anticipate any operational issue and find solu-

tions to ensure the continuity of study activities accord-

ing to the protocol. It also reinforces the level of

ownership by the NTP and prepares the future scale-up

of the intervention. The cost-effectiveness and qualita-

tive research components focusing on acceptability and

potential barriers such as stigma around tuberculosis

and its association to HIV bring crucial information for

future scale-up.

The CONTACT study will bring new evidence of al-

ternative ways for tuberculosis contact management in a

more convenient manner for children and their families

with an expected impact on TPT uptake, treatment

completion, and increase of case detection.

Study status

The study completed the first phase and participants’

enrolment started on 14 October 2019. Enrolment is ex-

pected to be completed in December 2021. The current

study protocol version is version 3.0: 24 June 2019.

Abbreviations

3RH: 3 months of rifampicin and isoniazid daily; 6H: 6 months of isoniazid

daily; CaP TB: Catalizing Pediatric TB Innovations; CHW: Community health

worker; CONTACT (study acronym): Community Intervention for Tuberculosis

Active Contact Tracing and Preventive Therapy; CXR: Chest radiography;

EGPAF: Elizabeth Glaser Pediatric AIDS Foundation; FDC: Fixed-dose

combination; H: Isoniazid; HIV: Human immunodeficiency virus;

IRB: Institutional Review Board; MedDRA: Medical Dictionary for Regulatory

Activities; MDR TB: Multidrug-resistant TB; NTP: National Tuberculosis

Program; R: Rifampicin; REDCap: Research Electronic Data Capture;

TB: Tuberculosis; TB-LAMP: TB loop-mediated isothermal amplification;

TPT: Tuberculosis preventive therapy; TST: Tuberculin skin test; WHO: World

Health Organization

Supplementary InformationThe online version contains supplementary material available at https://doi.

org/10.1186/s13063-021-05124-9.

Additional file 1. List of participating clusters.

Acknowledgements

This study is funded by Unitaid. Unitaid accelerates access to innovative

health products and lays the foundations for their scale-up by countries and

partners. We would like to thank Unitaid, EGPAF, the research teams, and the

study collaborators in the two countries.

Authors’ contributions

AV participated in the design of the study, protocol writing, and writing of

the manuscript. SED participated in writing the statistical details of the

protocol. SO participated in the data management aspects of the protocol

writing, and BT and DA participated in the study design and data collection.

EdC participated in the data collection and quality control. MK, PT, ST, and

AKK participated in the study design, and GT participated in the design and

data collection for the qualitative assessment. PJD participated in the study

design for the cost-effectiveness assessment. SG, MC, and JC participated in

protocol writing and study design. MB is the Coordinating Investigator and

supervised the protocol writing, data collection, and writing of the manu-

script. All authors read and approved the final manuscript.

Authors’ information

Not applicable

Funding

Unitaid is funding the CaP TB project through EGPAF. For the CONTACT

research study, EGPAF is using the funding through IRD. The funding

document available with the submission of this manuscript is the letter

between EGPAF and Institut Buisson Bertrand, a management center for the

IRD. The funding body has no role in study design, data collection, or writing

the manuscript. EGPAF (Dr Appolinaire Tiam, Elizabeth Glaser Pediatric AIDS

Foundation, 1140, Connecticut Av. Suite 200, NW, Washington, DC 20036) is

the sponsor of the trial.

Availability of data and materials

The research team at the IRD (Institut de Recherche pour le Développement)

in Montpellier, France, will have access to the final trial dataset from both

countries.

Ethics approval and consent to participate

The CONTACT study has been approved by the WHO Ethics Research

Committee, Advarra Institutional Review Board, and each local Research

Committee from Cameroon and Uganda. The approval letters are attached

to the submission. Informed consent will be obtained from all study

participants.

Consent for publication

Not applicable

Competing interests

The authors declare no competing interests.

Author details1French National Research Institute for Sustainable Development (IRD UMI

233 TransVIHMI- UM-INSERM U1175), Montpellier, France. 2Elizabeth Glaser

Pediatric AIDS Foundation, Yaoundé, Cameroon. 3Epicentre Research Center,

Vasiliu et al. Trials (2021) 22:180 Page 13 of 15

Page 101: Designing a community intervention for tuberculosis ...

Mbarara, Uganda. 4Elizabeth Glaser Pediatric AIDS Foundation, Mbarara,

Uganda. 5National Tuberculosis and Leprosy Program, Kampala, Uganda.6National Tuberculosis Program, Yaoundé, Cameroon. 7School of Health and

Related Research, University of Sheffield, Sheffield, UK. 8Centre for

International Child Health, University of Melbourne and Murdoch Children’s

Research Institute, Royal Children’s Hospital, Melbourne, Australia.9International Union Against Tuberculosis and Lung Disease (The Union),

Paris, France. 10Elizabeth Glaser Pediatric AIDS Foundation, Geneva,

Switzerland.

Received: 14 August 2020 Accepted: 11 February 2021

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