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brandonq2015 brandonq2015
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6 years ago
What would have undermined Edward Jenner's hypothesis about smallpox?
 
  A. the boy got cowpox but not smallpox
  B. the boy exposed to the cowpox virus still got smallpox
  C. some milkmaids did not get cowpox
  D. a cowpox vaccine is not possible
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elleduiselleduis
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6 years ago
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