NBCNews.com |
Here's One Reason Flu Vaccines Are So Lousy: They're Grown in Eggs
NBCNews.com Researchers have identified one more important reason flu shots don't usually work very well — it's because they are grown in chicken eggs. Flu viruses mutate every year and it turns out the methods used to make flu vaccines cause them to mutate even ... The Flu Shot During Pregnancy: Safe and Effective A Penn scientist says he knows why last year's flu vaccine was so bad H3N2 mutation in last year's flu vaccine responsible for lowered efficacy |
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