Key Points

The enhanced surveillance system for dengue, chikungunya, and Zika was activated from May 1 to November 30, the period of activity for the tiger mosquito (Ae. albopictus) in mainland France.

As in 2023, import pressure was particularly high for dengue during the 2024 season, linked to very active viral circulation in Guadeloupe and Martinique.

Thus, from May 1 to November 30, 2024, 2,107 cases of dengue were imported into mainland France (55% of which originated in the French Antilles).

In Occitanie, from May 1 to November 30, 2024, the following were identified:

• 178 imported cases of dengue, 3 imported cases of chikungunya, and 1 imported case of Zika;

• Three outbreaks of locally transmitted dengue (5 cases):

  • 1 case in Hérault residing in Montpellier (serotype undetermined) with possible exposure in the town of Pérols (date of onset of symptoms (DDS) on 06/17);

  • 2 intrafamilial cases in the Pyrénées-Orientales (serotype undetermined) residing in the municipality of Baho with possible exposure in Florac in Lozère (onset of symptoms on 07/16 and 07/19);

  • 2 cases of DENV-1 in the Hérault department residing in Vendargues (onset of symptoms on 09/08 and 09/09).