RT Book, Section A1 Ryan, Kenneth J. SR Print(0) ID 1148675767 T1 Legionella and Coxiella T2 Sherris Medical Microbiology, 7e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259859809 LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=1148675767 RD 2024/04/20 AB The death toll in the outbreak of the mysterious respiratory disease in Philadelphia rose by two to 25 as medical detectives accelerated efforts today to seek a chemical or poison as the possible cause.—The New York Times, August 7, 1976