Measles not eradicated in France

Measles has never fully disappeared from France, despite common belief, according to recent reports. A young mother in Marseille hesitates to vaccinate her newborn, thinking the disease is a thing of the past, but data shows otherwise.

Vaccination rates fall below critical threshold

In several French regions, the ROR vaccination coverage—covering measles, mumps, and rubella—has dropped below the critical 95% threshold. This is especially true among people aged 18-35, with coverage at 90.4% in metropolitan France.

Herd immunity threshold explained

The 95% threshold is crucial for herd immunity, which protects those who cannot be vaccinated. Measles is highly contagious, with one infected person potentially infecting 12 to 18 others. Falling below this threshold allows the virus to spread and cause outbreaks.

Reasons for declining vaccination rates

Distrust in vaccines, fueled by misinformation on social media, and simple forgetfulness among adults are key factors. Many adults born before widespread vaccination campaigns are unaware of their immune status and may not seek catch-up shots.

Measles resurgence in the United States

The U.S. is experiencing its worst measles outbreak since 1991, with nearly 3,887 confirmed cases and 42 new outbreaks by October 2026. Pennsylvania and New York have seen significant outbreaks, with some deaths reported.

Measles circulation in France

Thirty-four French departments reported measles cases between January and August 2026, indicating the virus is well-established. Urban areas like Paris and the Yvelines have higher case numbers due to population density and lower local vaccination rates.

Solutions to boost vaccination

Catch-up vaccinations are available at any age and are quick and accessible. Adults unsure of their immune status can get a serological test or a booster shot. Public awareness campaigns in affected regions could help raise vaccination rates and prevent further outbreaks.