TABLE 1.
Demographics and clinical manifestations of the index cases and household contacts
| Demographic or clinical manifestation | Value for group |
|||||||
|---|---|---|---|---|---|---|---|---|
| Index cases (n = 60) | All household contacts (n = 236) | Contacts with all-negative test results (n = 83) | Contacts with previous infections (n = 44) | Contacts with very recent infections (n = 11) | Contacts with active infection (n = 41) | Contacts with incident infections (n = 21) | Contacts with equivocal infections (n = 1) | |
| No. (%) of individuals of age (yr) | ||||||||
| ≤16 | 60 (100) | 82 (34.7) | 39 (47.0) | 8 (18.2) | 7 (63.6) | 8 (19.5) | 8 (38.1) | 1 (100.0) |
| >16 | 0 (0.0) | 154 (65.3) | 44 (53.0) | 36 (81.9) | 4 (36.4) | 33 (80.5) | 13 (61.9) | 0 (0.0) |
| Mean, median age (yr) | 8.6, 9.0 | 28.4, 26.0 | 23.5, 20.0 | 32.3, 15.0 | 14.5, 12.0 | 36.3, 33.0 | 29.6, 23.0 | 2.0, 2.0 |
| No. (%) of individuals of sex | ||||||||
| Female | 36 (60.0) | 150 (63.6) | 54 (65.1) | 33 (75.0) | 7 (63.6) | 25 (61.0) | 12 (57.1) | 1 (100.0) |
| Male | 24 (40.0) | 86 (36.4) | 29 (34.9) | 11 (25.0) | 4 (36.4) | 16 (39.0) | 9 (42.9) | 0 (0.0) |
| No. (%) of individuals with clinical manifestationa | ||||||||
| Classic chikungunya | 60 (100.0) | 10 (12.0) | 25 (61.0) | 4 (19.0) | 0 (0.0) | |||
| Undifferentiated fever | 0 (0.0) | 4 (4.8) | 1 (2.4) | 1 (4.8) | 1 (100.0) | |||
| Asymptomatic | 0 (0.0) | 69 (83.1) | 15 (36.6) | 16 (76.2) | 0 (0.0) | |||
a
Clinical manifestations are not presented for contacts with either a previous or a very recent infection as these contacts’ sign/symptom duration may not have overlapped the study period, hence leading to incomplete recall of signs/symptoms.