The World’s Deadliest Poison

by John S. Marr, MD, MPH, and Marcus A. Horwitz, MD Just after midnight on December 27, 1974, the telephone rang at the home of Dr. John Marr, the New York City Health Department’s principal epidemiologist. In theory he was always on call if a disease outbreak was suddenly to be recognized, but he had never been bothered. A call
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