A Legionnaires' outbreak in The Bronx has led to four deaths and a total of 65 people have been reported with the disease. 

Metro broke down the facts and here is all you need to know about the Legionnaires' disease and outbreak:

Source: Breathing in water vapors containing the bacteria typically from a hot tub, shower, humidifier or air-conditioning unit. It is not contagious and cannot be spread from person to person. 

Symptoms:Fever, chills, muscle aches, cough, headache, fatigue, loss of appetite and confusion.

Individuals reported with Legionnaires' disease: 65

Individuals with Legionnaires' hospitalized: 55

Individuals with Legionnaires' treated and discharged: 20

Individuals with Legionnaire's deceased: 4

*All deceased individuals were older adults with additional underlying medical problems*

Number of buildings visited in cluster area: 22

Number identified as cooling towers: 17

Number that tested positive: 5

Numer of locations finished with remediation: 4 (The fifth is expected to be completed Sunday afternoon.)

Treatment: Antibiotics, possible hospitalization. 

Prevention: The best way to prevent an outbreak is to ensure any water system is properly maintained and conforms relevant health and safety regulations, in this case because Legionella is commonly found in water. It would be pertinent to regulate the water temperature in the systems.