An outbreak of Legionnaires’ disease has been reported in a Bronx neighborhood, city health officials said Friday.

Four people in the borough’s Highbridge neighborhood have been diagnosed with the disease, which is a type of pneumonia caused by bacteria that forms in warm water, according to the city Department Of Health. Other individuals are awaiting test results.

Legionnaires’ is not contagious and is treatable with antibiotics if caught early, officials said. 

The health department said it is investigating and “sampling and testing water from all cooling tower systems in the area of the cluster.”

The Legionella bacteria typically grows in “cooling towers, whirlpool spas, hot tubs, humidifiers, hot water tanks, and evaporative condensers of large air-conditioning systems,” the department said.

Those experiencing flu-like symptoms such as coughing, fever and difficulty breathing are encouraged to get tested by their doctor. Those over the age of 50, cigarette smokers, chronic lung disease and those with compromised immune systems are considered higher risk to Legionnaires’.

“Any New Yorkers with flu-like symptoms should contact a health care provider as soon as possible,” Health Commissioner Dr. Ashwin Vasan said in a statement.