In July 1976, members of the American Legion veterans association who were gathered at a Philadelphia hotel began falling ill with a mysterious respiratory ailment that sickened 221 and killed 34. Months later, the US Centers for Disease Control announced that a new bacterium—Legionella pneumophila—had been identified as the culprit. It had spread through the hotel's air conditioning system. In 2010, it was reported that 20% of Legionella infections may come from what surprising source? Discuss (http://forum.thefreedictionary.com/postst32187_Legionnaire-s-Disease-Mystery-Declared-Solved--1977-.aspx)
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