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.
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: http://www.castanet.net/news/Canada/87723/Flu-shot-not-even-50-effective
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