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Volume 25, Number 11—November 2019
Research Letter

Endemicity of Yaws and Seroprevalence of Treponema pallidum Antibodies in Nonhuman Primates, Kenya

Dawn M. ZimmermanComments to Author , Emily H. Hardgrove, Michael E. von Fricken, Joseph Kamau, Daniel Chai, Samson Mutura, Velma Kivali, Fatima Hussein, Peris Ambala, Andrea Surmat, Joseph G. Maina, and Sascha Knauf
Author affiliations: Smithsonian Conservation Biology Institute, Washington DC, USA (D.M. Zimmerman, E.H. Hardgrove, M.E. von Fricken); George Mason University, Fairfax, Virginia, USA (D.M. Zimmerman, M.E. von Fricken); Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA (E.H. Hardgrove); Institute of Primate Research, Nairobi, Kenya (J. Kamau, D. Chai, S. Mutura, F. Hussein, P. Ambala); International Livestock Research Institute, Nairobi (V. Kivali); Mpala Research Centre and Wildlife Foundation, Nanyuki, Kenya (A. Surmat); Kenya Wildlife Service, Nairobi (J.G. Maina); German Primate Center, Goettingen, Germany (S. Knauf)

Main Article


Demographic data and serologic results for nonhuman primates sampled for Treponema pallidum antibodies, Laikipia County, Kenya, October 2016*

Species, age group† No. positive/no. tested (%)
Male Female
Olive baboon (Papio anubis)
Adult 21/21 (100) 10/10 (100)
Subadult 6/6 (100) 1/1 (100)
Juvenile 9/11 (82) 2/7 (29)
Infant 2/4 (50) ND
38/42 (90)
13/18 (72)
Vervet monkey (Chlorocebus pygerythrus)
Adult 0/1 (0) ND
Juvenile 1/1 (100) ND
1/2 (50)
Total 39/44 (89) 13/18 (72)

*Samples were tested by using the Dual Path Platform Assay or the Treponema pallidum Particle Agglutination Assay. ND, not done.
†Age ranges for P. anubis baboons, infant, <1.3 y; male juvenile, 1.3–6 y; female juvenile, 1.3–5 y; male subadult, 6–9 y; female subadult 5–6 y; male adult, >10 y; female adult, >6 y (Appendix reference 1). Age ranges for C. pygerythrus monkeys: juvenile, 22–40 mo; adult, >40 months (Appendix reference 2).

Main Article

Page created: October 15, 2019
Page updated: October 15, 2019
Page reviewed: October 15, 2019
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