Quote:
Originally Posted by kraznyi_oktjabr
Seasonal influenza is completely different thing. Unfortunately you can't known in advance which strain will be dominant each season. Therefore content of influenza vaccine is essentially an educated guess: sometimes its spot on, sometimes not so.
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That is usualy the case. Here I am told it is an educated guess and the seasonal flu vaccines (which seniors like myself get free) usually cover the three most likely strains that the experts feel will be present.