"Consuming large quantities of a key ingredient in beer can protect against winter sniffles and even some serious illnesses in small children, a Japanese brewery said, citing a scientific study."
That's good enough for us... no need to read any further!
According to the AFP, humulone (a compound found in hops) helps protect the body against viruses. The research suggests that up to 30 "commercial" beers would need to be consumed in order to get any significant level of humulone.
Since many craft-brewed IPAs are up to 10x hoppier than their commercial counterparts, perhaps 3-4 would do the trick!