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What Are Flu Vaccines Made of and why?

How to Wear a Mask

What Are Flu Vaccines Made of and why?

Flu shots contain numerous ingredients in very small quantities. They often include a deactivated flu virus. Each of the ingredients work together to ensure that the vaccine is safe and effective.

Influenza viruses are always changing, which means that the flu vaccine is updated every year. The Centers for Disease Control and Prevention (CDC) recommend that everyone over 6 months of age (with some exceptions) should have a flu vaccine each year.

Different forms of flu vaccine can have slightly different ingredients. For instance:

  • An injection usually contains tiny amounts of deactivated (therefore not harmful) flu viruses.
  • A nasal spray contains live viruses that have been weakened and are therefore not harmful. The CDC did not recommend the use of nasal spray for the 2017–2018 flu season.
 

Unusual Type of Virus Is Dominating Early Start to the Year’s Flu Season

Flu season in the United States can ramp up in the fall and peak anywhere between December and March, then drag itself out as late as May.

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Can the Flu Shot Vaccine Give You the Flu?

A common myth cited as a reason for not getting the flu shot is that the shot will give you the flu. That is scientifically impossible.

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