Key Points

Chikungunya, dengue, and Zika

• Launch of enhanced surveillance in France.

Notifiable diseases

• Update on reports of Legionnaires’ disease, hepatitis A, invasive meningococcal disease (IMD), measles, and foodborne illness outbreaks (FBO) in the Provence-Alpes-Côte d’Azur region: 39 reports in March 2025, including 7 cases of Legionnaires’ disease, 3 cases of hepatitis A, 9 cases of IIM, 18 cases of measles, and 2 outbreaks of foodborne illness.

• Increase in the number of IIM and measles cases since the beginning of 2025, with 25 cases (vs. 47 for all of 2024) and 47 cases (vs. 63 for all of 2024), respectively, as of April 29, 2025.