Influenza (flu) vaccines are vaccines that protect against the four influenza viruses that research indicates will be most common during the upcoming season. Most flu vaccines are given with a needle, usually in the arm, but there also is a nasal spray flu vaccine.
Influenza (flu) vaccines are vaccines that protect against the four influenza viruses that research indicates will be most common during the upcoming season. Most flu vaccines are given with a needle, usually in the arm, but there also is a nasal spray flu vaccine.
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