Multiple choice

Smallpox is a disease caused by the Variola major virus. Edward Jenner vaccinated against smallpox by using

  1. killed smallpox virus

  2. a recombinant protein derived from smallpox

  3. an unrelated virus

  4. toxoids

  5. cowpox
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The smooth unblemished skin of milkmaids gave Jenner the idea of using cowpox. The cowpox virus is non-virulent in man but shares antigens with the related smallpox virus and is therefore able to elicit protection against subsequent infection with smallpox.

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