Vaccinia virus particles,coloured transmission electron micrograph (TEM). Vaccinia belongs to the orthopoxvirus group. It causes cowpox,a disease of cattle and humans,which produces skin lesions. It was first used by Jenner in 1796 to vaccinate against smallpox,a related but more deadly human disease. The word vaccine is derived from vaccinia | |
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Crédit: | Science Photo Library / CDC |
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