Related Clues:
- Cause of chills, perhaps
- Wintertime vaccine target
- Virus that can be passed through kissing!!! Watch out
- Concern of a global WHO program
- Bug that's not hard to catch
- One insect let out another
- Common cause for sick days
- Insect larvae cleared on vegetable
- Word before shot or season
- Source of unwelcome strains
- Annual vaccine target
- It might give you the chills
- Winter weakener
- Minor ailment
- Seasonal ailment