Coughs and Colds

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Across
  1. 2. McDonald's equivalent of 1-down
  2. 5. You don't prescribe antibiotics for these
  3. 8. Friend and foe in our bodies
  4. 9. All I want for Christmas
Down
  1. 1. Jolly snowman, also at Wendy's
  2. 3. The fifth season, medical
  3. 4. H2O, Counsellor
  4. 6. Messenger, ribosomal, transfer, to name a few
  5. 7. Game of Thrones illegitimate sons, winter edition
  6. 10. Medical Sherlock Holmes, Counsellor