An outbreak of Legionnaires' disease caselinked to a Florida gym has brought cases to a 10-year-high in the state.
The Orange County "gym exposure" outbreak includes 14 cases of the disease, the Florida Department of Health said.
Legionnaires' disease is a serious type of pneumonia caused by the Legionella bacteria, according to the health department. The lung infection can be mild for healthy people but serious and sometimes deadly for certain at-risk groups.
"The most common way for someone to get sick is by breathing in mist containing Legionella," according to the U.S. Centers for Disease Control and Prevention.
The gym outbreak brings the total number of cases in Orange County in 2025 to 82, the highest in the state. Florida reported a total of 72 confirmed legionellosis cases in November. Florida has seen 665 cases in 2025.
Legionellosis case reports also include Pontiac fever, which is a milder infection caused by the same type of Legionella bacteria that causes Legionnaires' disease.
