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

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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