Key Points 

Leptospirosis 

• The ongoing seasonal resurgence of leptospirosis continues at a high level: 189 cases in 2026.

Dengue and Chikungunya

• 47 cases of chikungunya and 190 cases of locally acquired dengue have been detected since the beginning of the year, with several clusters of dengue cases observed in Saint-Leu, Le Tampon, L’Etang-Salé, La Possession, and various neighborhoods of Saint-Paul. Given the active circulation of dengue, chikungunya, and leptospirosis, the differential diagnosis of “chikungunya/dengue/leptospirosis” must be considered, with the option of ordering a triplex PCR test—available in all laboratories—for diagnostic confirmation, appropriate therapeutic management, and the implementation of specific control measures.

Flu-like syndrome 

• No public health impact.

Bronchiolitis in children under 2 years of age 

• Health indicators with a low level of intensity.

Acute gastroenteritis

• Health indicators have remained stable over the past few weeks.

COVID-19 

• Health and virological indicators at a very low intensity level.

Mpox 

• 11 cases (including 6 imported cases) were reported in Réunion between S05 and S21/2026.