Legionnaires' disease (LD) is a pneumonia caused by different varieties of Legionella bacteria. Pennsylvania is within the U.S. region that has the highest incidence of reported LD. In 2013, the Pittsburgh Regional Health Initiative (PRHI) and Allegheny County Health Department decided to update the county's guidelines. The purpose of these updated guidelines is to provide interested persons and organizations in western Pennsylvania—especially community hospitals, nursing homes, assisted living and high-rise retirement facilities—with updated information on Legionella and how to minimize its occurrence and impact in people and in the environment.
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