As U.S. Legionnaires' cases rise, so do expert theories on causes

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As U.S. Legionnaires' cases rise, so do expert theories on causes

By Julie Steenhuysen CHICAGO (Reuters) - Cases of Legionnaires' disease have been increasing dramatically in the United States, with reported cases in August alone more than doubling from expected levels for that period, U.S. health officials say. Infectious disease experts say they cannot pinpoint a single reason for the surge, but believe a combination of factors is at play, including an aging population that is more vulnerable to illness, better diagnostics, increased awareness of the disease, and possibly environmental factors. It is currently affecting scores of prisoners at the San Quentin State Prison in California.

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