On 12 February 2020, the European Centre for Disease Prevention and Control (ECDC) reported an increase in the number of cases of dengue infection in French Guiana, Guadeloupe, Martinique, and Saint-Martin. In January 2020, health authorities in the region declared a dengue epidemic in Guadeloupe and Saint-Martin and indicated that Martinique is also at-risk of an epidemic.
Dengue epidemics in these territories usually occur when there is a shift in the predominant circulating DENV serotype, and non-immune populations (e.g., tourists, new immigrants, or people not previously exposed to the circulating serotypes) are exposed to the new serotype through human movements within the territories or across neighboring countries. Local transmission occurs through the Aedes mosquito vector present on the islands and in French Guiana.