Jonas Salk and Frederick Murphy. Portrait of the US virologists Dr. Jonas Salk (1914-1995, left) and Dr. Frederick A. Murphy (right) during Dr. Salk's

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Jonas Salk and Frederick Murphy. Portrait of the US virologists Dr. Jonas Salk (1914-1995, left) and Dr. Frederick A. Murphy (right) during Dr. Salk's visit to the Centers for Disease Control and Prevention (CDC), Georgia, USA. Salk is best known for introducing the first polio vaccine in 1955, whilst Murphy is the former Director of the National Center for Infectious Diseases. Photographed in 1988.

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Photo credit: © CDC/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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