Since January 1, 2026, 44 cases of measles have been reported, including 14 new cases in March. The number of cases reported during the first quarter of the year is therefore significantly lower than that observed in 2025 (341 cases).
Of these 44 cases, 18 (41%) were hospitalized (including 2 in intensive care), and 11 cases (25%) experienced complications (including 5 cases of pneumonia and 1 case of encephalitis). No deaths were reported.
The median age of cases is 20.9 years. The 3 most affected age groups are infants under one year old (20%), adults aged 20-24 years (18%) and adults aged 40 years and over (18%).
Among the subjects targeted by vaccination (aged over one year and born since 1980) for whom vaccination status was known (n=25), 16 (64%) did not have up-to-date vaccination status while 9 (36%) were vaccinated with two doses.
22 departments (22%) reported at least one case during the period. The five departments with the highest number of reported cases are: Paris (14% of cases), Hauts-de-Seine (14%), Essonne (11%), Bouches-du-Rhône (7%), and Savoie (7%). No cases were reported in the French overseas territories.
During the period under review, 8 clusters (groups of epidemiologically linked cases) were reported to the Regional Health Agencies (ARS) for a total of 22 cases (provisional, unconsolidated data). Of these clusters, only one with 5 or more cases occurred in a daycare center and remains active.
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