JEAN-LOUP CHARMET / SCIENCE PHOTO LIBRARY JEAN-LOUP CHARMET / SCIENCE PHOTO LIBRARY
A doctor vaccinating a child against smallpox, after a painting by Desbordes in 1820. The doctor is seen inspecting the pustules that have resulted from the cowpox virus introduced into the patient. Cowpox is a mild viral disease, similar to the often fatal smallpox. This similarity allows cowpox antibodies to be produced which confer immunity against smallpox.
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