The Brain Teaser

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Across
  1. 5. clean (something), especially with a chemical, in order to destroy bacteria
  2. 7. designed to keep something undesirable such as illness or harm from occurring
  3. 9. the presence of a pathogen
  4. 11. the process of providing or obtaining the food necessary for health and growth
  5. 13. the state or quality of being resistant to a particular infectious disease or pathogen
  6. 14. a state of readiness
Down
  1. 1. a person or reanimated corpse
  2. 2. a state or period in which movement within or access to an area is restricted in interest of public safety or health
  3. 3. spread from one person or organism to another, typically by direct contact
  4. 4. a disorder of structure or function in a human, animal, or plant, especially one that has a known cause and a distinct group of symptoms
  5. 6. a state, period, place of isolation in which people or animals that may have been exposed to infectious disease are placed
  6. 8. treatment with a vaccine to produce immunity to a particular infectious disease or pathogen
  7. 10. conditions or practices conducive to maintaining health and preventing disease, especially through cleanliness
  8. 12. physical or mental feature which is regarded as indicating a condition of disease
  9. 15. a person qualified to treat people who are ill