Key Points

• As of October 1, 2022, 19 children under the age of 18 had been diagnosed in the area comprising the seven municipalities (Machecoul-Saint-Même, Port-Saint-Père, Sainte-Pazanne, Rouans, Saint-Hilaire-de-Chaléons, Saint-Mars-de-Coutais, Villeneuve-en-Retz) between 2015 and September 2022. The date of diagnosis for the last reported case was July 2021;

• The local situation is considered generally stable from an epidemiological standpoint compared to the findings of the 2019–2020 investigation;

• The continuation of this enhanced surveillance, initially planned for three years, will be evaluated at the end of 2023.