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From a date prior to 1967, this historic photograph, depicted a scientist in the process of inoculating Petri dish culture plates, during a plague investigation. Plague is caused by the bacterium, Yersinia pestis, and is transmitted from rodent to rodent, by infected fleas. At the time, this man was a staff member at the former San Francisco, California, Public Health Service, Communicable Disease Center, Plague Laboratory.
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