Epidemiological analysis reveals rapid transmission and high clinical attack rates during chikungunya outbreaks, highlighting the growing global threat of mosquito-borne alphaviruses.
In 2006, an outbreak of chikungunya fever — an arthralgic disease caused by a mosquito-borne alphavirus — swept over a number of islands in the Indian Ocean (the Comoros, Mauritius, the Seychelles, Madagascar, Mayotte, and Reunion). In Reunion, which has a population of 770,000, there were 265,000 clinical cases (an incidence of 34%), and the disease was implicated in 237 deaths (about 1 per 1000 clinical cases); a recent report by Reunion health authorities indicated that the seroprevalence was 35%, with very few asymptomatic cases. The epidemic had started with outbreaks in Kenya in 2004 and the Comoros early in . . .
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Charrel et al. (2007) studied this question.
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