Swine flu not prevented by 2,000 IU of vitamin D daily (the upper limit at the time) – RCT 2014 | VitaminDWiki
Wikipedia Usage Estimates Prevalence of Influenza-Like Illness in the United States in Near Real-Time | PLOS Computational Biology
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File:Epidemic curve of reported and confirmed pandemic influenza A(H1N1) cases in Taiwan.jpg - Wikimedia Commons
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