Quote:
Originally Posted by Bill14564
That may be what you read but that is not what I meant. I meant exact what I wrote: the flu vaccine is not 100% effective. (It looks like on its best days it is 60% effective but I don’t recall if that was preventing the flu or preventing serious illness)
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Some years it's 80% effective, one year I remember it was only 15% effective and they had to put out an additional vaccine. Since the strains vary, the effectiveness varies. In addition, it is always somewhat of a guess---teams go to Southeast Asia and China and take samples. The three (sometimes 4 or 5) most common strains are put in the vaccine.