ELMIRA, N.Y. -- The Chemung County Health Department has confirmed a fourth case of Legionnaire’s disease in Elmira.

Health officials say all four people are senior citizens who live in the Flannery Towers on Main Street.

Legionnaire's can cause pneumonia, often in people with compromised health. The health department says outbreaks usually come from a single source and they are working now to find that source.

So far, health officials say they're keeping their investigation limited to the towers and don't think anyone else is at risk. Anyone who has questions or concerns about Legionnaire's disease can call the Chemung County Health Department at (607) 737-2028.