Medical crossword

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Across
  1. 2. A place where people with serious medical problems are treated
  2. 5. used to inject
  3. 6. Protected against a disease or a virus
  4. 7. To contaminate
Down
  1. 1. Powerful form of medicine; penicillin is one
  2. 3. Man or woman who cuts people open
  3. 4. Man or woman whose job is to care for the sick
  4. 8. This sometimes means medicine, but not always.