Medical

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Across
  1. 3. distribute or disperse over a certain area
  2. 7. the presence of a virus in
  3. 8. the action or state of making or being made impure by polluting
  4. 9. a person, part of a leading position
Down
  1. 1. an appliance or aperture for ventilating a space.
  2. 2. a time of intense difficulty, trouble, or danger
  3. 4. dispense or apply
  4. 5. Medication used to treat a viral infection
  5. 6. a state of isolation or restricted access
  6. 7. likely to be transmitted to people, organisms, etc