Immune system

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Across
  1. 3. long, roundish rectangle with tentacles
  2. 6. Getting protection
  3. 7. invasion of tissue
  4. 8. Agent that caused coronavirus
  5. 10. coronavirus caused this
  6. 11. Virus without the fancy stuff
  7. 13. Similar to Rheus marker
Down
  1. 1. doesn't like outside body
  2. 2. spreading in limited region
  3. 4. Sneeze droplet
  4. 5. mode of transportation
  5. 9. viruses hate this one simple trick
  6. 10. part of an agent
  7. 12. swelling