Crossword

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Across
  1. 4. life threatening infection.
  2. 6. highly contagious virus that attacks the respiratory system.
  3. 8. collection of all microorganisms.
  4. 11. widespread occurrence of an infectious disease.
  5. 12. biological agent and a bacteria or fungus.
Down
  1. 1. infectious disease that is transmitted from animals to humans.
  2. 2. or showing no symptoms of a disease.
  3. 3. organism that transmits a pathogen from one host to another.
  4. 5. Degree of damage a pathogen causes.
  5. 7. type of medicine that's used to prevent bacteria.
  6. 9. toxin substance.
  7. 10. immunity/The first line of defense in the immune system.