DEPARTMENT OF EPIDEMIOLOGY AND PUBLIC HEALTH YALE SCHOOL OF MEDICINE Spirochete Transmission and Ticks Lyme Disease Prevention NYMPH FEMALE FEEDING DURATION IN HOURS PROBABILITY (%) OF TRANSMITTING Borrelia burgdorferi SCALE: The spirochetal agent of Lyme disease, Borrelia burgdorferi, is transmitted to humans through a bite of a nymphal stage deer tick Ixodes scapularis (or Ixodes pacificus on the West Coast). The duration of tick attachment and feeding is a key factor in transmission. Proper identification of tick species and feeding duration aids in determining the probability of infection and the risk of developing Lyme disease. Many kinds of ticks will bite people, but only Ixodes scapularis (or I. pacificus) carries Borrelia burgdorferi. I. Scapularis can be recognized by shape, size, and coloring. Adult stage ticks are about the size of an apple seed. Nymphs are tiny, about the size of the head of a pin. About 25% are infected and nymphs cause about 95% of the Lyme disease cases. Infected nymphs begin to transmit Borrelia burgdorferi 36 hours after attachment. The nymph increases in size as feeding progresses (see below). Any attached nymph should be promptly removed. Its appearance and size indicates the duration of feeding and probability of B. burgdorferi transmission. 1 mm 0 24 48 72 >96 100 80 60 40 20 0 Prepared by Durland Fish, Richard Falco & John Koethe © 2006 NOTE: TICKS APPEAR LARGER THAN ACTUAL SIZE. REFER TO SCALE.
Lyme Disease Prevention Spirochete Transmission and Ticks
Jun 07, 2022
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Microsoft PowerPoint - XSpirochete Transmission Poster 11 by 17.pptLyme Disease Prevention
SCALE:
The spirochetal agent of Lyme disease, Borrelia burgdorferi, is transmitted to humans through a bite of a nymphal stage deer tick Ixodes scapularis (or Ixodes pacificus on the West Coast). The duration of tick attachment and feeding is a key factor in transmission. Proper identification of tick species and feeding duration aids in determining the probability of infection and the risk of developing Lyme disease.
Many kinds of ticks will bite people, but only Ixodes scapularis (or I. pacificus) carries Borrelia burgdorferi.
I. Scapularis can be recognized by shape, size, and coloring. Adult stage ticks are about the size of an apple seed.
Nymphs are tiny, about the size of the head of a pin. About 25% are infected and nymphs cause about 95% of the Lyme disease cases.
Infected nymphs begin to transmit Borrelia burgdorferi 36 hours after attachment. The nymph increases in size as feeding progresses (see below).
Any attached nymph should be promptly removed. Its appearance and size indicates the duration of feeding and probability of B. burgdorferi transmission.
1 mm
80 60 40 20
0
SCALE:
The spirochetal agent of Lyme disease, Borrelia burgdorferi, is transmitted to humans through a bite of a nymphal stage deer tick Ixodes scapularis (or Ixodes pacificus on the West Coast). The duration of tick attachment and feeding is a key factor in transmission. Proper identification of tick species and feeding duration aids in determining the probability of infection and the risk of developing Lyme disease.
Many kinds of ticks will bite people, but only Ixodes scapularis (or I. pacificus) carries Borrelia burgdorferi.
I. Scapularis can be recognized by shape, size, and coloring. Adult stage ticks are about the size of an apple seed.
Nymphs are tiny, about the size of the head of a pin. About 25% are infected and nymphs cause about 95% of the Lyme disease cases.
Infected nymphs begin to transmit Borrelia burgdorferi 36 hours after attachment. The nymph increases in size as feeding progresses (see below).
Any attached nymph should be promptly removed. Its appearance and size indicates the duration of feeding and probability of B. burgdorferi transmission.
1 mm
80 60 40 20
0
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