During the nineteenth century, a physician named Edward Jenner noticed that cows get a disease called cowpox, which is similar in its symptoms to a disease that infects humans called smallpox; however, humans cant contract cowpox. Jenner also noticed that milkmaids were immune to smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child was subsequently immune to smallpox. How did the child develop immunity to smallpox?

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    The cowpox virus was so similar to the smallpox virus that it stimulated "immunological memory" of the smallpox virus.
    The cowpox virus prevented the smallpox virus from entering the lytic cycle.
    The child had a particularly strong immune system that prevented him from contracting smallpox.
    The cowpox virus prevented the smallpox virus from entering the lysogenic cycle.
asked May 19, 2013 in Biology by anonymous
    

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The cowpox virus was so similar to the smallpox virus that it stimulated "immunological memory" of the smallpox virus.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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