Influenza vaccines provide moderate protection against virologically confirmed influenza, according to meta-analysis data published online in The Lancet Infectious Diseases (26 October 2011).
The analysis found that trivalent inactivated vaccines confer 59 per cent pooled efficacy (95 per cent confidence interval 51–67) against influenza in healthy adults and live attenuated influenza vaccine resulted in 83 per cent pooled efficacy (CI 69–91) in children aged six months to seven years.
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Extract taken from PJ Online