Key Points

• In 2021, 62 cases of Legionnaires' disease among residents of Normandy were reported.

• This number is higher than in 2020. This increase is also observed in mainland France.

• However, the regional incidence remains among the lowest in mainland France.

• The characteristics of the cases are identical to those observed at the national level and in previous years.

• The proportion of cases in which a Legionella strain was isolated from patients was higher than in 2020.