CDC
Centers for Disease Cntrol and Prevention
Morbidity and Mortakity Weekly Report
published on January 18, 2013
# Early Estimates of Seasonal Influenza Vaccine Effectiveness in the United States in January 2013
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6202a4.htm?s_cid=mm6202a4_w
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