Volume 24, Number 4—April 2018
Synopsis
Seroprevalence of Chikungunya Virus after Its Emergence in Brazil
Table
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.
Page created: March 19, 2018
Page updated: March 19, 2018
Page reviewed: March 19, 2018
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