Sarah Stewart, US oncologist

Sarah Stewart, US oncologist

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Credit: NATIONAL CANCER INSTITUTE/SCIENCE PHOTO LIBRARY

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Caption: Sarah Stewart (1905-1976), US oncologist, showing oncogenic (cancer-causing) virus particles. Stewart was the first to show that viruses causing cancer could be spread from animal to animal. She discovered the Polyomavirus in 1953, which causes tumours to develop in a wide range of species. The SE (Stewart-Eddy) polyomavirus is named after Stewart and her research partner Bernice Eddy, who successfully grew the virus in 1958. Photographed in 1971.

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