On the edge: the climatically sensitive dengue vector mosquito Aedes aegypti in the Americas Andrew Monaghan National Center for Atmospheric Research 17 April 2015 1
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On the edge: the climatically sensitive dengue vector mosquito Aedes aegypti in the Americas Andrew Monaghan National Center for Atmospheric Research 17.
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Slide 1
On the edge: the climatically sensitive dengue vector mosquito
Aedes aegypti in the Americas Andrew Monaghan National Center for
Atmospheric Research 17 April 2015 1
Slide 2
Acknowledgements: Collaborators NCAR: Mary Hayden Daniel
Steinhoff Katherine Dickinson Paul Bieringer Ryan Cabell Kevin
Sampson Other Institutions Kacey Ernst, U. Arizona Cory Morin, NASA
MSFC Jamie Cavanaugh, U. Colorado Carlos Welsh Rodriguez, U.
Veracruzana Lars Eisen, Saul Lozano, Colorado State U. Emily
Zielinski-Gutierrez, CDC Christopher Tittel, Florida Department of
Health in Monroe County Michael Doyle, Monroe County Mosquito
Control, Rolando Diaz Caravantes, Lucia Castro, Colegio de Sonora
Anne Cox, Nederland H.S. And many others 2
Slide 3
Acknowledgements: Students! 3
Slide 4
Ae. aegypti at its high altitude margins (NSF: GEO-1010204) Ae.
aegypti early career investigator (NASA: NNX14AI89G) Ae. aegypti in
Key West and Tucson (NIH: NIAID R56AI09184) Ae. aegypti in the
Sonoran Desert (NIH: IR01AI091843 ) Dengue biosurveillance (DTRA:
HDTRA1-13-C-0081) Acknowledgements: Grants 4
Slide 5
Presentation Outline Background Aedes aegypti, dengue and
weather Aedes aegypti, dengue and humans Conclusions 5
Slide 6
Background 6
Slide 7
Aedes aegypti: a clever mosquito Vector of dengue Also a vector
of chikungunya and yellow fever Lives in close association with
humans Exploits artificial containers near and in homes for
immature life stages Adult females feed almost exclusively on human
blood. Leg biter. Females often rest and feed indoors Feeds during
daytime when humans are active 7 cdc.gov
Slide 8
Aedes aegypti and Weather Meteorological factors impact Ae.
aegypti numerous ways: Temperature envelope determines survival and
development rates Daily temperature range regulates development
rates Rainfall provides the water required for the immature stages
Temperature affects adult feeding behavior Temperature modulates
dengue incubation period in mosquito Humidity affects adult
survival rates 8 cidd.psu.edu tijerasrainbarrels.com
Slide 9
Dengue Fever Dengue Fever and Dengue Hemorrhagic Fever are
caused by dengue viruses transmitted by Aedes mosquitoes Annually,
~400 million people contract dengue worldwide No approved vaccine
available Increasing number and severity of cases in the Americas,
including U.S. 9 Nature.com Bvgh.org
Slide 10
Ae. aegypti Humans Dengue Virus Emergence of Dengue Environment
10
Slide 11
Aedes aegypti, dengue and weather 11
Slide 12
WHATCHEM: Water Height and Temperature in Container Habitats
Energy Model SW: Shortwave radiation LW: Longwave radiation H:
Sensible heat L: Latent heat G: Ground heat C: Conduction from
container surfaces S: Heat storage The heat storage (i.e., change
in temperature) in the water container is equal to the balance of
energy to/from the container (Steinhoff et al. 2015, JME) 12
Slide 13
The day-to-day temperature variability is resolved by WHATCHEM.
There are big temperature differences among containers at the same
site! WHATCHEM Field Results: Veracruz, Mexico Observations
WHATCHEM (Steinhoff et al. 2015, JME) Date (2013) Full Sun 5-gal
Black Full Shade 5-gal Black
Slide 14
Courtesy Paul Bieringer, NCAR, STAR, LLC Aedes/Dengue Risk
Mapping System 14
Slide 15
Results: # of Infected Female Ae. aegypti, 2013 15 JANAPRMARFEB
MAYAUGJULJUN SEPDECNOVOCT Courtesy Paul Bieringer, NCAR, STAR, LLC
Infected egg-laying female Ae. aegypti 4000 5000 3000 2000 1000
0
Slide 16
16 Courtesy Paul Bieringer, NCAR, STAR, LLC Results: # of
Infected Female Ae. aegypti, 2013 Infected egg-laying females
Slide 17
Aedes aegypti, dengue and humans 17
Slide 18
Household Survey in Key West, FL, 2012 Methods: 400 parcels
randomly selected in Key West and Stock Island Knowledge, Attitudes
and Practices survey Pupal collections concurrent with household
surveys (Hayden et al. 2015, AJTMH) 18
Slide 19
In the past 2 months, have you seen (or heard) any dengue
prevention materials? 66% (Hayden et al. 2015, AJTMH) 19
Slide 20
Household survey: Do you know of any diseases that are
transmitted by mosquitoes in the Keys? Dengue West Nile virus
MalariaNoneOther 20 Percentage of Yes responses (Hayden et al.
2015, AJTMH)
Slide 21
How likely is it that you or a family member will get dengue in
the next five years? (Hayden et al. 2015, AJTMH) 21 Percentage of
total responses
Slide 22
Results Ae. aegypti indicators 5.9% Key West households had at
least one Ae. aegypti pupa 1.6 (Key West) containers with water per
house 22 (Hayden et al. 2015, AJTMH)
Slide 23
Conclusions Meteorological variables modulate the abundance of
the vector mosquito Ae. aegypti and dengue risk. This knowledge can
be used to develop surveillance systems to inform public health, or
to project climate change impacts on dengue. However, even with
accurate weather-based predictions of dengue risk, without properly
developed behavioral interventions, few humans will likely be aware
of the risk. The involvement of the social scientists throughout
the conception and execution of such projects is imperative to
ensure that climate-based predictions will benefit society. 23