Vacca means cow in Latin. The word vaccination came to be used after Edward Jenner, an English doctor, experimentally infected a boy with extract from cowpox lesion before infecting him with small pox in his attempt to make the boy develop resistance to smallpox. There has been a significant drop in the incidence of infectious diseases for which vaccination has been introduced. An example of this is smallpox, once a major cause of death worldwide. The smallpox virus is now found only in freezers in high-containment laboratories.
Vaccines are available for many infectious diseases.
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