The reported cases of Legionnaires' disease more than tripled to 4,200 between 2000 and 2011, and the actual incidence of the disease may be far greater, some medical experts say. The number of annual cases likely is between 56,000 and 113,000, said Paul Edelstein of the University of Pennsylvania, citing research by German scientists. Up to 40% of Legionnaires' cases may go undetected by routine tests, Edelstein said. "A lot of people die of Legionnaires' disease thinking they can cure it with chicken soup or whiskey," he said.

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