Key Points

Dengue, Chikungunya, and Zika

• Since the last bulletin, we have learned of two new outbreaks of locally transmitted chikungunya, one in the municipality of Auribeau-sur-Siagne (1 case) and one in the municipality of Nice (1).

• Furthermore, the epidemiological situation in Vitrolles and Antibes has changed since the last bulletin, particularly due to the identification of numerous new locally transmitted cases during door-to-door surveys conducted on August 3 and August 4.

• As of August 12, the Provence-Alpes-Côte d’Azur (PACA) region has recorded 11 episodes of local transmission: 8 of chikungunya and 3 of dengue. In total, 49 local cases of chikungunya (+27) and 6 local cases of dengue (+1) have been identified.

• Since the start of enhanced surveillance (May 1), 182 imported cases (+6 since the last update) have been identified in the region: 90 cases of dengue, 91 of chikungunya, and 1 case of Zika.

West Nile Virus Infections

• Since the last bulletin, 3 new cases of West Nile virus (WNV) infection have been reported: 2 in the Var and 1 in the Bouches-du-Rhône.

• As of August 12, the Provence-Alpes-Côte d’Azur region has recorded 5 cases of WNV infection: 3 in the Var department, all in the municipality of Hyères, and 2 cases in the Bouches-du-Rhône department, 1 in Gardanne and 1 case contracted in Arles or Tarascon.

Heat Wave

• A heat wave has been affecting the Paca region since August 9, 2025. All departments are currently under an ORANGE Heat Wave alert.

• According to Météo France, temperatures are expected to remain high throughout France in the coming days. Heat-related activity by emergency services and SOS Médecins associations is on the rise in both networks.