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Admin13862012-12-27



Subject: Flu shot not even 50% effective Thu Feb 21, 2013 7:42 pm Subject: Flu shot not even 50% effectiveThu Feb 21, 2013 7:42 pm



The study estimates how well the vaccine did at preventing people from becoming sick enough to need to see a doctor, preventing "medically attended flu" in influenza science parlance. And the data suggest this year the vaccine didn't perform very well for older adults.



It found that a flu shot cut an older adult's risk of contracting a case of influenza A H3N2 that needed medical care by only nine per cent.



When the scientists calculated the overall effectiveness, the vaccine's ability to prevent medically attended flu caused by both flu A and B viruses, the estimate was 27 per cent for older adults.



more here: This year's flu vaccine provided little protection to people 65 and older who got a shot, new data released by the U.S. Centers for Disease Control reveal.The study estimates how well the vaccine did at preventing people from becoming sick enough to need to see a doctor, preventing "medically attended flu" in influenza science parlance. And the data suggest this year the vaccine didn't perform very well for older adults.It found that a flu shot cut an older adult's risk of contracting a case of influenza A H3N2 that needed medical care by only nine per cent.When the scientists calculated the overall effectiveness, the vaccine's ability to prevent medically attended flu caused by both flu A and B viruses, the estimate was 27 per cent for older adults.more here: http://www.castanet.net/news/Canada/87723/Flu-shot-not-even-50-effective

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