How is Legionnaires' disease transmitted?
Legionnaires' disease is contracted by inhaling water vapor containing Legionella bacteria. It is not transmitted from person to person.
Health / Disease Outbreak
A cluster of Legionnaires' disease cases has been identified in New York City, primarily in the Central Harlem neighborhood. As of late July 2025, there have been at least 22 confirmed cases and one death. Health officials are urging reside...
Legionnaires' disease is a respiratory illness caused by the Legionella bacteria. These bacteria thrive in warm water environments, making cooling towers, whirlpool spas, hot tubs, humidifiers, hot water tanks, and large air-conditioning systems potential breeding grounds. The disease is contracted by inhaling water vapor containing the bacteria.
**Background Context:** The recent outbreak in Central Harlem has prompted the New York City Health Department to investigate and sample all operable cooling towers in the affected area. Building owners with positive screening results have been directed to initiate remediation within 24 hours.
**Symptoms and Risks:** Symptoms of Legionnaires' disease typically appear 2-14 days after exposure and can include:
**Who This Affects Most:**
**How to Prepare:**
**Historical Context:** The disease was named after an outbreak at a Pennsylvania American Legion convention in 1976. Cases of Legionnaires' disease have been rising in the United States, with a peak in 2018. New York City experienced a major outbreak in 2015.
Legionnaires' disease is contracted by inhaling water vapor containing Legionella bacteria. It is not transmitted from person to person.
Legionnaires' disease is treated with antibiotics. Early diagnosis and treatment are essential to prevent complications.
Legionella bacteria grows in warm water systems such as cooling towers, hot tubs, humidifiers, hot water tanks, and large air-conditioning systems.
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