Key Points

Chikungunya

• 65 new confirmed cases in Week 10 of 2026, a 22% decrease compared to Week 9, bringing the total to 360 cases since the beginning of the year.

• The incidence remains high, indicating that the virus is still circulating in the region.

• Moderate activity in the south, with no municipalities reporting more than 10 cases; persistent cases in the northeast, particularly in Mamoudzou and Koungou.

• Transmission could continue or intensify, due to weather conditions favorable to mosquito proliferation.

Bronchiolitis

• A marked decrease in epidemic activity in Week 10 following several weeks of increase, with the peak having been reached in Week 9 of 2026.

• Virological indicators are declining: 29 positive RSV samples in Week 10 compared to 55 in Week 09, with a positivity rate of 35% (vs. 44%).

• High hospital activity among children under 1 year of age: 20 emergency department visits, including 14 hospitalizations (hospitalization rate: 70%).

• One severe case admitted to the ICU in Week 10, but not related to RSV.