On 4 January 2019, the National IHR Focal Point for France informed WHO of five human autochthonous cases of Rift Valley Fever (RVF) diagnosed on Mayotte Island through the Early Warning and Response System of the European Union. The dates of symptom onset ranged from 22 November to 31 December 2018.
From November 2018 to 03 May 2019, 129 confirmed human Rift Valley Fever (RVF) cases and 109 animal foci (23 small ruminants and 86 bovine) have been reported in Mayotte. After a steady decline in cases during the last three weeks of March 2019, a slight increase has been observed in April 2019. As of 3 May 2019, one new human case but no new animal foci have been reported. Both human RVF cases and animal foci are mainly located in the center and the north west of the main island Grande-Terre. However, since the end of March 2019, a few new animal foci have also been detected in the east of Grande-Terre and in Petite Terre of Mayotte.