Key Points

Dengue

• After a three-week lull (Weeks 17–19), the territory of Mayotte is experiencing a marked resurgence in dengue transmission. In Week 20, 10 cases, 9 of which were locally acquired, were identified

• With the exception of two cases, all locally acquired cases resided in Petite-Terre

Leptospirosis

• From January 1 to May 19, 2024, 123 biologically confirmed cases of leptospirosis were reported, more than double the number in 2023 (57 reported cases)

• Compared to 2023, the incidence has risen, from 19 cases per 100,000 inhabitants in 2023 to 41 cases per 100,000 inhabitants in 2024 (data as of May 21, 2024)

• Among the cases reported in 2024, one death was recorded

• Since August 24, 2023, leptospirosis has been classified as a notifiable disease (ND)

Acute gastroenteritis (AGE)

• Sales of anti-diarrheal medications in sentinel pharmacies remain at a higher level than in previous years

• Increased detection of pathogenic bacteria in gastrointestinal samples (rising positivity rate)

• No new severe cases have been admitted to intensive care since S17-2024

Pertussis

• Resurgence in Europe and mainland France amid an “immunity gap” following the COVID-19 pandemic

• In Mayotte, a resurgence is also being observed (27 cases since the start of the year compared to 16 in 2023 for the entire year)

Bronchiolitis

• No current outbreak

Influenza

• No current outbreak