Key Points

• A total of 116 confirmed cases of chikungunya were recorded between S10 and S18-2025, including 57 locally acquired cases, 29 imported cases, and 30 cases of unknown status

• A steady increase in the number of detected cases between S10 and S17, with a sharp rise in S17-2025 followed by stabilization in S18

• It is possible that school holidays and the presence of a Thursday holiday affected healthcare utilization

• Chikungunya cases have been detected in 15 of Mayotte’s 17 municipalities, with a higher concentration in the municipalities of Pamandzi and Mamoudzou

• Dengue circulation remains low on the island, with 9 confirmed cases since the beginning of the year, including 3 in week 17 but none in week 18