Key Points

• In 2023, 70 cases of Legionnaires' disease were reported among residents of Normandy.

• Although slightly lower than in 2022, the regional notification rate (2.0 per 100,000 inhabitants) remains among the highest in Normandy over the past decade.

• The characteristics of the cases were identical to those observed in other years.

• 27% of clinical isolates, a proportion stable compared to 2022.

• 43% of cases in which risk exposure was reported; the distribution of reported exposure types was similar to previous years.