Flu seasons are unpredictable in a number of ways, including when they begin, how severe they are, how long they last and which viruses will spread. There were more uncertainties than usual going into this flu season (2009-2010), because of the emergence of the 2009 H1N1 influenza virus (previously called “novel H1N1″ or “swine flu”). This virus caused the first influenza pandemic (global outbreak of disease) in more than 40 years.

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