Key points

Acute Gastroenteritis

• Rotavirus A AGE outbreak on the decline but still ongoing in Mayotte

Acute respiratory infections

• Start of circulation of influenza viruses and respiratory syncytial virus (which causes bronchiolitis)

Waterborne diseases

• Increase in waterborne diseases in 2025. Between January 1 and September 30, 2025, 109 confirmed cases of typhoid fever and 101 confirmed cases of hepatitis A were reported

Chikungunya, dengue, and Zika

• Chikungunya continues to circulate in the department, with a risk of an epidemic resurgence during the rainy season