Key points

• 1,089 cases of dengue fever reported since the start of the outbreak, including 904 confirmed cases in 2020

• Incidence has stabilized in the north

• Increase in the number of cases in the south

• DENV-1 serotype predominant (DENV-2 serotype identified in 2 imported cases)

• Rainy season conducive to an increase in the mosquito population

• Dengue epidemics in the Indian Ocean region: risk of importation of new cases and serotypes