Vaccines

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Across
  1. 3. molecules that pathogens have on their surface
  2. 4. virus that is affecting the world today
  3. 6. Jenner English doctor discovered that infection with the relatively harmless cowpox provided immunity against the extremely deadly smallpox virus.
  4. 7. used to elicit immunity through the use of dead or weakened pathogens
Down
  1. 1. Our immune system remembers which ___ it has previously fought
  2. 2. latin word: cowpox
  3. 5. protein package with genetic material