Related Clues:

• Bug with two homonyms
• Viral illness
• Blue ___ (cops' sickout)
• Debilitating bug
• Target of some shots
• Seasonal affliction
• H1N1, for example
• H1N1, e.g.
• Swine ___
• It might be going around
• __ shot
• It may be prevented with a shot
• Swine __
• World Health Organization concern
• It goes around in winter