Since January 1, 2025, 868 cases of measles have occurred and been reported (an increase of 2 new cases in November). The decline in the number of cases observed since May continued until September and is holding steady until November, in line with the known seasonality of measles.
Of these cases, 305 (35%) were hospitalized (including 12 in intensive care), and 121 cases (14%) experienced a complication (including 70 cases of pneumonia and 2 cases of encephalitis). Four deaths attributable to measles were reported, all in immunocompromised patients.
The median age of cases is 16.7 years. The 4 most affected age groups are children aged 1-4 (15%), adults aged 40 and over (14%), and young people aged 10-14 (12%) and 15-19 (12%).
Among the subjects targeted by vaccination (aged over one year and born since 1980), for whom vaccination status was known (n=614), 406 (66%) were unvaccinated or incompletely vaccinated, 191 (31%) were vaccinated with two doses and 17 (3%) cases were vaccinated without the number of doses received being specified.
72 departments in France (71%) reported at least one case during the period, including 4 cases reported in the French overseas territories (Réunion). The five departments with the highest number of reported cases are: Nord (15%), Bouches-du-Rhône (6%), Aude (6%), Haute-Savoie (5%), and Isère (5%).
During this period, 113 clusters of cases (groups of epidemiologically linked cases) were reported to the Regional Health Agencies (ARS) (provisional, unconsolidated data) for a total of 523 cases. Among them, 31 clusters involved 5 or more cases, and only one cluster (of imported origin) is still active.