What is cowpox pus

What is cowpox pus

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    8 年前
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    What is cowpox pus?

    Cowpox pus is the residues in cowpox infected skin area of cows.

    At the end of 19th Century, it was used widely as a vaccine for prevention against the more deadly small pox disease in human after the English physician Edward Jenner researched for many years in it.

    2012-10-27 18:26:15 補充:

    By 1980, the World Health Organisation declared that the world is free from small pox. This is a direct result from the discovery of using cowpox 'pus' as a preventive vaccine against small pox in late 19th Century.

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