The New York City Health Department announced the community cluster of the disease Friday. All seven cases have been confirmed in the last seven days. The area impacted is the Lenox Hill neighborhood, which runs from East 60th Street to East 77th Street.
Four of those infected with the disease are still hospitalized, two have been discharged and the person who died was in his/her 90s and had significant underlying health conditions.
Legionnaires' disease is caused when water tainted with Legionella bacteria is inhaled into the lungs. It's a severe form of pneumonia in which the lungs become inflamed due to infection.
The health department said symptoms include fever, cough, chills, muscle aches, headache, fatigue, loss of appetite, confusion and diarrhea. Symptoms usually appear two to 10 days after significant exposure to Legionella bacteria.