Table 2.
CHIKV seroprevalence and asymptomatic rates reported in other serosurveys
| Author | Date of completion | Location | Virus lineage | Primary vector | Attack rate (N) | Proportion of asymptomatic cases | Population sampling |
|---|---|---|---|---|---|---|---|
| Kumar and others7 | 2007 (during the outbreak) | Kerala, India | IOL | Aedes albopictus | 55.8% (259/381) | 3.8% (10/260) | Systematic clustered |
| Moro and others8 | 2007 (3–5 months post-outbreak) | Emilia-Romagna, Italy | IOL | Ae. albopictus | 10.2% (33/325) | 18.2% (6/33) | Systematic random |
| Ayu and others9 | 2007 (1 year post-outbreak) | Bagan Panchor, Malaysia | Asian | Aedes spp. | 55.6% (40/72) | 17.5% (7/40) | Systematic clustered |
| Sissoko and others10 | 2007 (post-outbreak) | Mayotte | IOL | Ae. albopictus | 38.1% (440/1,154) | 27.7% (122/440) | Multistage cluster |
| Aedes aegypti | |||||||
| Gérardin and others11 | 2006 (during outbreak) | La Réunion | IOL | Ae. albopictus | 18.2% (162/888) | Not estimated | Stored sera of pregnant women |
| Gérardin and others11 | 2006 (post-outbreak) | La Réunion | IOL | Ae. albopictus | 38.2% (weighted estimate: 967/2,442) | 16.7% (162/967) | Systematic random |
| Sergon and others12 | 2004 (9 weeks after the peak of the outbreak) | Lamu Island, Kenya | ECSA | Aedes spp. | 75% (215/288) | 45.1% (118/215) | Systematic proportional to size of census unit |
| Sergon and others13 | 2005 (at the peak of the outbreak) | Grande Comore Island, Comoros | IOL | Ae. aegypti | 63.1% (209/331) | 14.3% (30/209) | Systematic multistage |
| Nakkhara and others14 | 2011 (2 years after the beginning of the outbreak | Phatthalung, Thailand | IOL | Ae. albopictus | 61.9% (314/507) | 47.1% (148/314) | Systematic (whole village) |
| Ae. aegypti |
CHIKV = chikungunya virus; ECSA = east/central/south African; IOL = Indian ocean lineage.