Chikungunya Outbreak Response unit

Chikungunya: the situation in a nutshell

• Chikungunya is an infectious disease caused by an arbovirus, the chikungunya virus.
• Between 2010 and 2024, no cases were detected on the island of Réunion. In 2025, Réunion experienced a major epidemic with nearly 54,550 biologically confirmed cases of indigenous chikungunya and 43 deaths. The end of the epidemic was declared on June 24, 2025, by the health authorities. At the same time, Mayotte also experienced active circul