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of orthopoxviruses are similar enough that the body becomes immune to both cow- and smallpox.

Medical use

Naturally occurring cases of cowpox were not common, but it was discovered that the vaccine could be "carried" in humans and reproduced and disseminated human-to-human. Jenner's original vaccination used lymph from the cowpox pustule on a milkmaid, and subsequent "arm-to-arm" vaccinations applied the same principle. As this transfer of human fluids came with its own set of complications, a safer manner of producing the

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