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A few months <a href=" http://www.mieskuorolaulajat.fi/?viafem-reviews-uk.pdf#weekly ">does viafem work</a> The flu season has historically taken place during December through March. According to the Centers for Disease Control and Prevention (CDC), the protection from the vaccine lasts up to a year. Each year the CDC conducts research to determine the main flu viruses that are likely to be circulating. However, with the newer strains such as H1N1, the flu season has expanded into more of a year round possibility. The flu season may start as early as October and last until May.