If influenza has a 鈥渟eason鈥?where does it go the rest of the year?

In other words, why does a virus even have a season? The question refers to influenza in general, and not specifically Avian influenza (H5N1).

I don鈥檛 think either answer completely answers the question although they come close. I already know what flu season is. What I鈥檓 not sure about is WHY. One responder indicated that the weather provided a better environment for the virus at certain times. If so, we should see a different flu season in southern and northern states.

Flu "season" is simply the time of year when people are more likely to catch the flu than at other times of the year. It never really goes away--if you're exposed to it, you can get the flu any time.

i think it's weather conditions that make it suitable for the virus to thrive and certain times of the year has the correct balance of these conditions.

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