Key words crossword

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Across
  1. 3. an occurrence of a large number of disease
  2. 5. simple, unicellular animals comprising some 50,000 animals
  3. 6. an epidemic that affects multiple geographic areas
  4. 7. a wide spread infectious disease in one area
  5. 10. the act of coming into contact with a disease
  6. 11. single celled prokaryote
Down
  1. 1. ultramicroscopic infectious agent
  2. 2. any disease producing agent like a virus
  3. 4. people who study epidemics
  4. 8. a microscopic organism
  5. 9. a substance that contains antigenic components