The Bellevue-Stratford Hotel in July 1976, when it hosted a statewide convention of the American Legion. Soon after, a pneumonia-like disease killed 29 people and sickened 182 more who had been in the hotel. The vast majority were members of the convention. The negative publicity associated with what became known as "Legionnaires' Disease" caused occupancy at the Bellevue-Stratford to plummet to 4 percent and the hotel finally closed on November 18, 1976. In 1977, Dr. Joseph McDade discovered a new bacterium, which was identified as the causative organism. It thrives in hot, damp places like the water of the cooling towers for the
1976 Philadelphia Legionnaires' disease outbreak testing specimens. While the Center for Disease Control responded rapidly, as did the Pennsylvania Health Department, it took six months for the CDC microbiologist Joseph McDade to discover the cause of the outbreak. He initially thought the cause was viral because blood and tissues from the victims failed to grow bacteria when incubated in culture medium. His subsequent attempts to isolate the viral agent in eggs included antibiotics to kill off "contaminating" bacteria. It was only when he omitted the antibiotics that the bacteria grew in eggs. Attempts to reproduce the disease in mice, the standard laboratory animal model, also