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Volume 26, Number 7—July 2020
Synopsis

Transmission of Chikungunya Virus in an Urban Slum, Brazil

Rosângela O. Anjos, Vánio André Mugabe, Patrícia S.S. Moreira, Caroline X. Carvalho, Moyra M. Portilho, Ricardo Khouri, Gielson A. Sacramento, Nivison R.R. Nery, Mitermayer G. Reis, Uriel D. Kitron, Albert I. Ko, Federico Costa, and Guilherme S. RibeiroComments to Author 
Author affiliations: Fundação Oswaldo Cruz, Salvador, Brazil (R.O. Anjos, P.S.S. Moreira, C.X. Carvalho, M.M. Portilho, R. Khouri, G.A. Sacramento, N.R.R. Nery Jr., M.G. Reis, U.D. Kitron, A.I. Ko, F. Costa, G.S. Ribeiro); Universidade Licungo, Quelimane, Mozambique (V.A. Mugabe); Universidade Federal da Bahia, Salvador (V.A. Mugabe, R. Khouri, N.R.R. Nery Jr., M.G. Reis, F. Costa, G.S. Ribeiro); Yale University, New Haven, Connecticut, USA (M.G. Reis, A.I. Ko, F. Costa); Emory University, Atlanta, Georgia, USA (U.D. Kitron); University of Liverpool, Liverpool, UK (F. Costa); Lancaster University, Lancaster, UK (F. Costa)

Main Article

Table 3

Comparison of sociodemographic and clinical characteristic of participants with symptomatic versus asymptomatic chikungunya virus infection Salvador, Brazil, November 2016 to February 2017*

Characteristic Disease status of infected participants, no. %†
p value
Symptomatic, n = 32 Asymptomatic, n = 177
Sociodemographic
Sex
M 12 (37.5) 81 (45.8) 0.39
F 20 (62.5) 96 (54.2)
Age, y
5–14 2 (6.3) 40 (22.6) 0.07
15–39 22 (68.8) 82 (46.3)
≥40 8 (24.9) 55 (31.1)
Education‡
Illiterate 1 (3.1) 13 (7.4) 0.42
Literate 31 (96.9) 163 (92.6)
Skin color
White 0 10 (5.7) NA
Nonwhite 32 (100) 167 (94.3)
Household per capita income, US$/day‡
≤5.50 27 (84.4) 144 (81.8) 0.73
>5.50
5 (15.6)
32 (18.2)

Clinical: reported symptoms
Fever and arthralgia
None 0 111 (62.7) <0.01
Only fever 0 39 (22.0)
Only arthralgia 0 20 (11.3)
Both, not simultaneous 0 7 (4.0)
Both, simultaneous 32 (100) 0
Myalgia
Yes 18 (56.3) 24 (13.6) <0.01
No 14 (43.7) 153 (86.4)
Rash
Yes 22 (68.7) 28 (15.9) <0.01
No 10 (31.3) 148 (84.1)
Pruritus
Yes 21 (65.6) 25 (14.1) <0.01
No
11 (34.4)
152 (85.9)

Presumptive clinical diagnosis
Chikungunya
Yes 20 (62.5) 12 (6.8) <0.01
No 12 (37.5) 165 (93.2)
Dengue
Yes 4 (12.5) 17 (9.6) 0.62
No 28 (87.5) 160 (90.4)
Zika
Yes 18 (56.3) 20 (11.3) <0.01
No 14 (43.7) 157 (88.7%)

*NA, not available
†CHIKV disease status was defined as symptomatic on the basis of self-reported fever accompanied by arthralgia after January 2015.
‡Data not available for 1 participant with an asymptomatic CHIKV infection.

Main Article

Page created: April 08, 2020
Page updated: June 18, 2020
Page reviewed: June 18, 2020
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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