Coughs and Colds

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