The lines of defence

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Across
  1. 2. swallow things
  2. 5. Causes diseases
  3. 7. Covid
  4. 10. a defensive barrier
Down
  1. 1. swelling
  2. 3. Single cell organisms
  3. 4. a type of barrier
  4. 6. Physical barrier
  5. 8. Chemical barrier
  6. 9. high temp