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.
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Athe smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms
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Bso too do today`s immunologists in deriving the smallpox vaccine of a live virus, which has been obtained from the pustules of infected organisms
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Cthe modern smallpox vaccine itself is derived from a live virus that immunologists have obtained, coming from the pustules of infected organisms
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Dso immunologists today use the pustules of infected organisms to obtain a live virus from which the modern smallpox vaccine is derived
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Eso modern immunologists have obtained the live virus in the pustules of infected organisms, from which the smallpox vaccine is derived
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正确答案: D