Possible Clues:

• Viral infection
• Highly contagious disease
• Grippe, an often epidemic viral disease
• Common viral disease
• Sporting fanzine admits top Liverpudlian joining United is likely to make a lot of people sick
• Officially informing (someone)
• Strange file -- a nun catching unknown disease
• Messing about with zeal, in fun, brings complaint
• Wacky fanzine about Leeds United forwards that's spread virally
• Viral disease took off, say, in its abbreviated form