A Legionnaires' disease outbreak in New York City's Central Harlem neighborhood has resulted in 81 confirmed cases and three deaths as of August 7, 2025. The cluster affects residents in ZIP codes 10027, 10030, 10035, 10037, and 10039. Health officials have linked the outbreak to contaminated cooling towers, which are structures used to cool buildings and contain water. Eleven cooling towers initially tested positive for the bacteria that causes Legionnaires' disease. Authorities continue to investigate the source and urge anyone in the affected areas experiencing flu-like symptoms to seek immediate medical attention. Despite the outbreak, residents are advised that it remains safe to use water for drinking, bathing, cooking, and air conditioning. The disease primarily affects older individuals and is associated with poorly maintained cooling systems.