Have you ever wondered why there is a flu 'season'

[news]

http://i.cbc.ca/1.3461920.1456330689!/cpImage/httpImage/image.jpg_gen/derivatives/16x9_460/flu-vaccine.jpg Shots aren’t available until Monday but flu season is already underway.


More... (http://start.westnet.ca/newstempcb.php?article=canada/calgary/flu-season-shots-1.3810423)

From http://start.westnet.ca News
News Provided By
WestNet Wireless Internet