Could be. The reason I'm interested in the idea is that there was a flu-like illness going around here earlier in the year and now, looking back, I can't help but remember how many people had severe coughs. Purely anecdotal and likely just a paranoid, biased opinion, of course.
Just a quick question about that bolded bit - if somebody had it in, say, January and got over it with few to no symptoms, would they still be able to test positive for it in March?
It was the flu not a "flu like illness".