Chikungunya virus disease outbreaks in the Indian Ocean region and globally (January 2026)
A global resurgence of chikungunya virus (CHIKV) disease was observed in 2025. Major outbreaks have been documented across multiple World Health Organization (WHO) regions, including the African, South-East Asia, and the Region of the Americas.
Approximately 502,264 CHIKV disease cases (suspected and laboratory-confirmed) and 186 deaths were reported globally from 41 countries and territories between 1 January to 10 December 2025. The most severely affected region was the region of the Americas, accounting for the highest number of reported cases and deaths, while substantial outbreaks were also reported in the European region, driven largely by transmission in French overseas territories, particularly La Réunion Island.
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