The plague of the doomed

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Across
  1. 4. Separation to avoid infection
  2. 6. A widespread deadly sickness
  3. 7. Made unsafe or impure
  4. 10. Contact with a harmful substance
  5. 13. A change in a disease’s structure
  6. 14. Decomposing or breaking down
  7. 15. A total breakdown of systems
  8. 16. Forced isolation to stop sickness
  9. 19. A biological danger
  10. 22. The process of breaking down over time
  11. 23. A slow fall toward failure or death
  12. 24. A person receiving medical care
  13. 26. The spread of disease
  14. 27. The ability to survive harsh conditions
  15. 28. Slowly dying or weakening
  16. 29. Extremely infectious
Down
  1. 1. A disease-causing organism
  2. 2. Made unsafe by disease
  3. 3. Leading to death, not recovery
  4. 5. A feeling of having no future left
  5. 8. Natural protection from sickness
  6. 9. Showing signs of high temperature
  7. 11. A sign of illness
  8. 12. A sudden spread of illness
  9. 15. One who spreads disease
  10. 17. The spread of disease through the body
  11. 18. A ruined, lifeless place after collapse
  12. 20. A condition causing suffering
  13. 21. Gradual weakening of the body
  14. 25. A state of panic when survival feels uncertain