Table 1.
Demographic data and infection status of index cases and associates
| 2014 | 2015 | |||
|---|---|---|---|---|
| Index cases | Associates | Index cases | Associates | |
| N = 186 | N = 298 | N = 124 | N = 86 | |
| Age in years, mean (SD) | 20.6 (15.5) | 35.3 (19.1) | 28.0 (18.6) | 38.8 (20.0) |
| Gender, % female | 90/186 (48.4%) | 195/295 (66.1%) | 68/124 (54.8%) | 58/86 (67.4%) |
| Temperature > 38°C | 30/185 (16.2%) | 2/290 (0.7%) | 23/124 (18.5%) | 0/86 (0%) |
| Fever in the prior 7 days | 179/185 (96.8%) | 33/285 (11.6%) | 119/124 (96.0%) | 3/83 (3.6%) |
| DENV infection | ||||
| Acute infection | 75/186 (40.3%) | 45/298 (15.1%) | 24/124 (19.4%) | 5/86 (5.8%) |
| Recent infection | 57/186 (30.6%) | 61/298 (20.5%) | 11/124 (8.9%) | 6/86 (7.0%) |
| Hospitalized | 34/186 (18.3%) | Not applicable | 21/124 (16.9%) | Not applicable |
| Other acute infections | ||||
| Chikungunya virus | 0/152 (0%) | Not applicable | 53/123 (43.1%) | 3/86 (3.5%) |
| Zika virus | Not applicable | Not applicable | 0/123 (0%) | 0/86 (0%) |
DENV = dengue virus; IgM = immunoglobulin M; NS1 RT = nonstructural protein 1 rapid test; SD = standard deviation. Characteristics of index cases and associates in 2014 and 2015: mean age (SD) and gender, febrile status, hospitalization status, and arbovirus infection status (DENV acute infection: NS1 RT, NS1 ELISA, or reverse transcription polymerase chain reaction (RT-PCR) positive; DENV recent infection: IgM positive and NS1 RT/NS1 ELISA/RT-PCR negative; chikungunya virus and Zika virus confirmed by RT-PCR).