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Volume 24, Number 4—April 2018
Synopsis

Seroprevalence of Chikungunya Virus after Its Emergence in Brazil

Juarez P. Dias, Maria da Conceição N. Costa, Gubio Soares Campos, Enny S. Paixão, Marcio S. Natividade, Florisneide R. Barreto, Martha Suely C. Itaparica, Cristina Goes, Francisca L.S. Oliveira, Eloisa B. Santana, Neusa S.J. Silva, Carlos A.A. Brito, Laura C. Rodrigues, Silvia Inez Sardi, Ramon C. Saavedra, and Maria Glória TeixeiraComments to Author 
Author affiliations: Instituto de Saúde Coletiva, Rua Basílio da Gama, Salvador, Brazil (J.P. Dias, M.C.N. Costa, E.S. Paixão, M.S. Natividade, F.R. Barreto, M.S.C. Itaparica, M.G. Teixeira); Instituto de Ciências da Saúde, Av. Reitor Miguel Calmon, Salvador (G.S. Campos, S.I. Sardi); London School of Hygiene and Tropical Medicine, London, UK (E.S. Paixão, L.C. Rodrigues); Secretaria Municipal da Salvador, Salvador (M.S.C. Itaparica); Faculdade de Tecnologia e Ciências,Av. Artêmia Pires Freitas, Sim, Brazil (C. Goes); Secretaria Municipal de Saúde de Feira de Santana, Feira de Santana, Brazil (F.L.S. Oliveira, E.B. Santana, N.S.J. Silva); Secretaria de Saúde do Estado da Bahia, Salvador (R.C. Saavedra); Universidade Federal de Pernambuco, Pernambuco, Brazil (C.A.A. Brito)

Main Article

Table

Seroprevalence of CHIKV among survey participants reporting symptomatic, asymptomatic, and chronic infection. Bahia state, Brazil, 2015–2016*

Patient characteristics
 George Américo, Feira de Santana
Alto do Cemitério, Riachão do Jacuípe
No. participants
 No. positive
 Prevalence, %
 No. participants
 No. positive
 Prevalence, %
Age group, y†
1–19 88 46 52.3 45 17 37.8
20–39 123 72 58.5 109 55 50.5
40–59 121 69 57.0 144 63 43.8
>60 53 33 62.3 148 69 46.6
Total
 385
 220
 57.1
446
 204
 45.7
Sex
M 129 80 62.0 127 59 46.5
F 256 140 54.7 319 145 45.5
Total
 385
 220
 57.1
446
 204
 45.7
Serologic results
IgG 385 163 42.3 446 138 30.9
IgM 385 25 6.5 446 38 8.5
IgM and IgG 385 32 8.3 446 28 6.3
Total
 385
 220
 57.1
446
 204
 45.7
Self-reported chikungunya infection
Yes‡ 220 72 32.7 204 84 41.2
No§ 220 148 67.3 204 120 58.8
Total
 220
 220
 100.0
204
 204
 100.0
Self-reported chronic form¶
Yes 72 49 68.1 84 63 75.0
No 72 23 31.9 84 21 25.0
Total 72 72 100.0 84 84 100.0

*Selected area of each city. The difference in the seroprevalence rate of the 2 areas was statistically significant (p = 0.001). CHIKV, chikungunya virus.
†Children <1 y of age were not included in the study.
‡Attack rate of symptomatic CHIKV infection.
§Attack rate of asymptomatic CHIKV infection.
¶Percentage among positive symptomatic cases of CHIKV infection.

Main Article

Page created: March 19, 2018
Page updated: March 19, 2018
Page reviewed: March 19, 2018
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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