NEW YORK (TNND) — Two people are dead among the 58 who have been diagnosed with Legionnaires' disease in Harlem since July 25, according to New York health officials.

The New York City Health Department said in a Monday update that they have been investigating a cluster of the disease in Central Harlem ZIP codes 10027, 10030, 10035, 10037, and 10039, and bordering communities.

Health officials linked the outbreak to cooling towers, structures containing water and a fan that are used to cool buildings. Eleven of the towers initially tested positive for Legionella pneumophila, a type of bacteria that causes Legionnaires' disease, but the problem has been remedied.

"People living or working in the area with flu-like symptoms, such as cough, fever, chills, muscle aches, or difficulty breathing, should contact a health care provider immediately," a statement read. "It is especially important for people at higher risk - including those ages 50 and older, cigarette smokers, and people with chronic lung disease or compromised immune systems - to get care if they have symptoms."

Legionnaires' disease is a type of severe pneumonia caused by the Legionella bacteria, which can grow and spread in building water systems, according to the CDC. Examples include showerheads, sink faucets, hot tubs and decorative fountains and water features.

Symptoms can develop two days to two weeks after exposure and include cough, fever, headaches, muscle aches and shortness of breath.

If it goes untreated, respiratory failure, shock and kidney or multi-organ failure can occur, the World Health Organization (WHO) said.

WHO suggests regularly cleaning and disinfecting cooling towers, maintaining an adequate level of chlorine in spa pools and flushing unused taps in buildings weekly to help prevent the disease.