When it comes to Legionnaires' disease, this doctor explains how buildings can prevent it and what symptoms to watch for an early diagnosis.

Nearly 60 people have become sick and two have died in an outbreak of Legionnaires' disease in New York City. Health officials there issued an alert on July 30 warning residents of Central Harlem who have flu-like symptoms to see a health care provider immediately.

The Legionnaires' disease outbreak in NYC is now blamed for a third death and continues to spread. CBS News New York spoke with one doctor who explained anyone can be diagnosed with the disease, and some people are more at risk.