Overview

• Santé publique France confirmed five additional chikungunya deaths between March 31 and May 11, raising the island’s total fatalities to 20 since August 2024.
• All five of the newly attributed deaths involved patients aged 68 to 95 with chronic comorbidities, and 37 other deaths are under investigation for potential linkage to the virus.
• The outbreak peaked in late April, after which confirmed cases and emergency visits began a sustained decrease across the island.
• Nearly 53,000 biologically confirmed cases have been recorded in La Réunion this year, though health authorities warn the true infection count is likely much higher due to undiagnosed cases.
• Mayotte has just entered an epidemic phase, reporting 560 confirmed cases in 2025 and experiencing intense, widespread chikungunya transmission.