Smallpox crossword puzzle

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Across
  1. 2. very simple microorganism that infects cells and may cause disease
  2. 4. created the smallpox vaccine
  3. 6. drugs that fight diseases caused by viruses
  4. 8. First to be vaccinated against smallpox
  5. 10. were very vulnerable to Smallpox
  6. 11. where smallpox started
  7. 13. terrorism involving the release of toxic biological agents
Down
  1. 1. a way to immunize a person from a virus
  2. 3. contagious disease caused by the variola virus
  3. 5. most known symptom of smallpox
  4. 7. last known case of smallpox
  5. 9. was used to control smallpox
  6. 12. needle used for smallpox vaccine