Legionnaires' Outbreak in NYC Worries Residents

Roughly 81 cases of the potentially deadly disease have been reported so far.
1:24 | 08/04/15

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Transcript for Legionnaires' Outbreak in NYC Worries Residents
Okay, Jon Karl, thanks very much. Health news now and a deadly disease outbreak in New York City. At least seven people have now died from legionnaires decemb' disease. 81 cases reported so far and Dr. Rich Besser is here. You headed up the legionnaires' disease unit at the CDC for seven years. What causes this and how does it spread? Yeah, these outbreaks are tricky. Legionnaires' disease is severe pneumonia and you get it by breathing in the mist that have it. They occur from the summer from cooling towers on buildings and decorative fountain, all things that produce mist. You see it with older adults, people who are current or former smokers, with lung disease, have cancer, diabetes, kidney seize. How did authorities figure what was happening with this? They interviewed everybody to see if there was something in common and there wasn't. So what they did was they mapped them all out to see where did they live and found they lived all across the south bronx so used Google map, Google Earth to find all the cooling towers on the tops of those buildings and cultured them. 17 cooling towers, five were positive. They're cleaning them and hoping that cleaning those towers will shut down the outbreak. We can hope. Thanks so much. Dr. Besser will trach your questions throughout the morning. You can tweet him @drrichardbesser.

This transcript has been automatically generated and may not be 100% accurate.

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