Influenza vaccines, also known as?flu shots?or?flu jabs, are?vaccines?that protect against infection by?influenza?viruses.?New versions of the vaccines are developed twice a year, as the?influenza virus?rapidly changes.?While their effectiveness varies from year to year, most provide modest to high protection against influenza.The United States?Centers for Disease Control and Prevention?(CDC) estimates that vaccination against influenza reduces sickness, medical visits, hospitalizations, and deaths.Immunized workers who do catch the flu return to work half a day sooner on average.?
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