Pittsfield, MA (News10) -- More than half a dozen positive Legionella cases have turned up recently in Berkshire County. While the exact source of these cases is unknown, the search is on to find the source.

Over the past four months, Berkshire Medical Center's lab has shown seven positive test results for Legionella, a bacteria that causes Legionnaire's disease, a severe form of pneumonia. While there is currently no conclusive evidence as to where the bacteria came from, the hospital is exercising caution; it flushed its water system and is increasing the amount of chlorine in the water, as well as its filtration system.

The Pittsfield Mayor's Office is assisting, working in direct contact with Berkshire Medical Center and the Massachusetts Department of Public Health.

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