What You Need to Know About the Flu Vaccine: What It Is, How It Works and Potential Side Effects to Watch Out For

young boy flu shot

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  • There are two main categories of flu shots. The trivalent flu shot aims to protect the body against the influenza A virus H1N1, influenza A virus H3N2 and an influenza B virus. The second one is the quadrivalent flu shot which is administered to combat four flu viruses (the first three viruses mentioned and another influenza B virus)

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