a flu vaccine every year. According to the Center for Disease Control and Prevention there are several flu vaccine options for the 2013-2014 flu season: Traditional flu vaccines made to protect against three different flu viruses (called “trivalent” vaccines) are available. In addition, this season flu vaccines made to protect against four different flu viruses (called “quadrivalent” vaccines) also are available. The trivalent flu vaccine protects against two influenza A viruses and an influenza…
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