Flu vaccine paradox adds to public health debate

[news]

http://i.cbc.ca/1.2912852.1421434097!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/h1n1-flu-vaccine.jpg People who receive flu vaccines year after year can sometimes show reduced protection, an effect that Canadian infectious disease specialists say muddies public health messages for annual flu vaccine campaigns.


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