Flu Shot's Effectiveness Questioned

Flu vaccine found to be not as effective as previously thought.
1:19 | 10/25/11

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Transcript for Flu Shot's Effectiveness Questioned
The new questions tonight about the flu vaccine 130 million Americans 43% of us. Got a flu shot last year and that's the most flu shots ever and this country. But tonight a new study suggests that -- flu shot is not a perfect -- so is it still the right answer. We want to bring -- ABC's chief health and medical editor doctor Richard Dresser tell -- what's in the study. So this is a big study it's from a top researcher at the university of Minnesota -- look at all of the flu vaccine studies over the past 44 years. And the results I think you're gonna surprise a lot of people because the vaccine doesn't work as well as we would like. The flu shot in adults eighteen to 65 is only 60% effective. The flu mist vaccine in nasal spray it does better 80% effective in children younger than seven and in the elderly would we just don't know how -- -- But 60%. In the adult population that's the effect this is 88%. And is that because it misses the strains that are coming toward us -- all time there's something out. It's a combination some years it's a bad it's a bad fit for that -- the years it just. Isn't the right vaccine you need a better vaccine but I have to tell you this CDC each year since 3000 to 49000 people die from the flu. So even though it's not the best vaccine. The best we have and it's worth getting.

This transcript has been automatically generated and may not be 100% accurate.

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