New York City health officials have issued warnings to residents and visitors of Central Park and several Manhattan neighborhoods due to an ongoing outbreak of Legionnaires' disease. As of Sunday evening, 18 individuals have been diagnosed with the potentially life-threatening, pneumonia-like illness in the Carnegie Hall and Yorkville areas. This marks a significant increase from the two cases reported on Thursday.
The New York City Health Department advises individuals who have lived in, worked in, or visited the affected ZIP codes—10028, 10128, and 10075—since late June to monitor for symptoms. Additionally, anyone who visited the east side of Central Park between East 76th and East 97th Streets since late June is also urged to be vigilant. Flu-like symptoms should prompt immediate contact with a healthcare provider.
Legionnaires' disease is caused by the Legionella bacteria, which can infect the lungs and lead to a severe form of pneumonia. While the bacteria are naturally found in freshwater environments, they can become dangerous when they grow and spread in man-made water systems. Cooling towers, a common component of building temperature control systems, are suspected as the likely source of the current outbreak, though a specific tower has not yet been identified. Officials recommend continuing to use air conditioning during high temperatures.
The disease typically develops two to 10 days after exposure to contaminated water droplets, which are often inhaled. Symptoms can include a high fever, cough, shortness of breath, chest pain, headache, muscle pain, and in severe cases, confusion. It does not spread from person to person. While most healthy individuals are at low risk, the elderly, smokers, and those with underlying health conditions are more vulnerable.
Legionnaires' disease is treatable with antibiotics, often accompanied by rest, fluids, and oxygen for severe cases. Most patients recover fully with prompt medical care, though it can take several weeks. The overall fatality rate is around 10%, but it is higher for hospitalized patients, seniors, and individuals with pre-existing health issues. Last year, a similar outbreak in Harlem resulted in seven deaths and 90 hospitalizations among 114 confirmed cases.
An estimated 8,000 to 18,000 Americans are hospitalized with Legionnaires' disease annually, according to the Centers for Disease Control and Prevention, with experts believing the actual number may be higher due to undiagnosed cases. The incidence of Legionnaires' disease in the U.S. has reportedly increased ninefold since 2000.