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Volume 30, Number 9—September 2024
Dispatch

Retrospective Seroprevalence of Orthopoxvirus Antibodies among Key Populations, Kenya

Kristi Loeb1, Kieran A. Milner1, Candice Lemaille, Brielle Martens, Derek Stein, Julie Lajoie, Souradet Y. Shaw, Anne W. Rimoin, Placide Mbala-Kingebeni, Nicole A. Hoff, Ryan S. Noyce, Keith R. Fowke, Joshua Kimani, Lyle McKinnon, and Jason KindrachukComments to Author 
Author affiliations: University of Manitoba, Winnipeg, Manitoba, Canada (K. Loeb, K.A. Milner, C. Lemaille, B. Martens, D. Stein, J. Lajoie, S.Y. Shaw, K.R. Fowke, J. Kimani, L. McKinnon, J. Kindrachuk); Cadham Provincial Laboratory, Winnipeg (D. Stein); University of Nairobi, Nairobi, Kenya (J. Lajoie, K.R. Fowke, J. Kimani, L. McKinnon); University of California–Los Angeles, Los Angeles, California, USA (N.A. Hoff, A.W. Rimoin); Institut National de Recherche Biomédicale, Kinshasa, Democratic Republic of the Congo (P. Mbala-Kingebeni); University of Alberta, Edmonton, Alberta, Canada (R.S. Noyce)

Main Article

Table

Demographic data for all participants in a retrospective study of seroprevalence of orthopoxvirus antibodies among key populations, Nairobi, Kenya, 2013–2018*

Characteristic Human orthopoxvirus seropositivity
 Total (%)
Positive Negative
Age group, y
<19 0 1 (0.2) 1 (0.2)
20–39 37 (37.4) 188 (33.8) 225 (34.3)
40–55 36 (36.4) 242 (43.4) 278 (42.4)
56–65 8 (8.1) 60 (10.8) 68 (10.4)
>65 2 (2.0) 5 (0.9) 7 (1.1)
Unknown 16 (16.2) 61 (11.0) 77 (11.7)
Total
 99
 557
 656
Sample collection year
2013 1 (1.0) 7 (1.3) 8 (1.2)
2014 5 (5.1) 55 (9.9) 60 (9.1)
2015 3 (3.0) 15 (2.7) 18 (2.7)
2016 3 (3.0) 13 (2.3) 16 (2.4)
2017 61 (61.6) 277 (49.7) 338 (51.5)
2018 26 (26.3) 190 (34.1) 216 (32.9)
Total
 99
 557
 656
HIV status
Negative 11 (11.1) 82 (14.7) 93 (14.2)
Positive 88 (88.9) 475 (85.3) 563 (85.8)
Total
 99
 557
 656
Key population
Female sex worker 63 (63.6) 411 (73.8) 474 (72.3)
GBMSM 15 (15.2) 46 (8.3) 61 (9.3)
Non–sex worker 21 (21.2) 100 (17.9) 121 (18.4)
Total 99 557 656

*Participants were enrolled at the Sex Workers Outreach Program (SWOP) in Nairobi, Kenya. Values are no. (%). Seropositivity determined by ELISA using UV-inactivated vaccinia virus. GBMSM, gay, bisexual, and other men who have sex with men.

Main Article

1These first authors contributed equally to this article.

Page created: July 30, 2024
Page updated: August 21, 2024
Page reviewed: August 21, 2024
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