ema-adama
18-09-09, 06:55 PM
How is it measured? Do the studies measure antibodies or incidence of flu? Is there a difference?
I have read that the flu vaccine has about a 20% efficacy rate. But I can't remember where? Is this number true?
I have read that the flu vaccine has about a 20% efficacy rate. But I can't remember where? Is this number true?