What Disease am I?

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Across
  1. 2. Microscopic agent that enters and hijacks cells
  2. 5. Body temperature rises as a defense response
  3. 6. Easily spread from person to person
  4. 8. Tiredness caused by immune system activation
  5. 11. Muscle and joint discomfort during illness
  6. 12. Organ that becomes inflamed during infection
Down
  1. 1. Thick fluid produced in the airways
  2. 3. When microbes invade and multiply in the body
  3. 4. Pressure or pain felt in the skull
  4. 7. Discomfort in the throat when swallowing
  5. 9. Body system that fights off invaders
  6. 10. A reflex to clear the respiratory tract