- 匿名8 年前最愛解答
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.