Edward Jenner Was Able to Demonstrate the First Example of Immunological

question 14

Multiple Choice

Edward Jenner was able to demonstrate the first example of immunological cross-protection because

• A) the smallpox virus was nonpathogenic.
• B) the cowpox virus only affected milkmaids.
• C) cowpox and smallpox viruses were metabolically different.
• D) cowpox virus was structurally similar to the smallpox virus.
• E) plague survivors were immune to smallpox.

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