History o' Disease

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Across
  1. 2. An epidemic that has spread across several countries and continents
  2. 3. The case of the London water pump
  3. 5. The rapid spread of a disease to a large number of people above what is normally expected and within a short period of time
  4. 13. A respiratory disease
  5. 14. Connected to the history of inoculation
  6. 15. The same as an epidemic but occurring over a more limited geographic area
  7. 17. Organization that studies disease
  8. 19. An infectious agent made of DNA or RNA that can only grow and multiply by using the machinery of other cells
  9. 20. Contributed to germ theory by understanding microbes
  10. 21. Blood defense
  11. 22. A person that is not showing any signs of having a disease despite being infected
Down
  1. 1. Smallpox inoculator
  2. 2. Infantile paralysis
  3. 4. When enough people in a population are immune to a disease
  4. 6. the study of the distribution, causes, and risk factors of health-related states and events in specified populations
  5. 7. A factor, such as a microorganism, that is essential for the occurrence of a disease.
  6. 8. A biological preparation that is usually made of an inactivated or weakened version of a virus or bacteria
  7. 9. The proportion of persons with clinical disease, who after becoming infected, become severely ill or die
  8. 10. Refers to someone who shows no clinical signs of infection after exposure to a pathogen
  9. 11. A disease caused by an infectious agent that can pass between humans and other animals
  10. 12. Death. Europe, 1347-1351
  11. 16. United States, 1918
  12. 18. Smallpox relative