To date, more than 266,000 cases were estimated to have occurred in the island (760,000 inhabitants). Most of cases are expressed as a mild disease, with intense fever and arthralgias, with rare but serious complications (encephalitis, liver, cardiac or renal failures.) having required a hospitalization in an intensive care unit. 273 of such serious cases (immediately life threatening condition) have been reported among the cases, in patients aged over 10 days (59% were 65+ age old). Chikungunya was proven in 246 serious cases; 101 patients had comorbidities, and 27% of confirmed cases eventually died. In addition 44 cases of mother-to-child infections were reported and 40 were confirmed (one died).