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The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox. A which caused only a mild illness, they are immune from 分析该选项
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, the smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms.
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, the smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, so too do today's immunologists in deriving the smallpox vaccine of a live virus, which has been obtained from the pustules of infected organisms
Jul 31, 2018 · The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox,causing only a mild illness, they became immune from smallpox. The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they would become immune to smallpox.
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, so modern immunologists have obtained the live virus in the pustules of infected organisms, from which the smallpox vaccine is derived
The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox,which caused only a mild illness, they would become immune to smallpox. The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.
Dec 9, 2019 · The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox,which caused only a mild illness, they would become immune to smallpox. The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which causes only a mild illness, they are immune to smallpox.
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, the smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms
