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Why is there a different vaccine for the flu every year?

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Why is there a different vaccine for the flu every year?

It’s because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them. Located around the world are influenza surveillance centers that annually monitor the most common strains, collecting data and identifying new and evolving strains.

How long does immunity from the flu vaccine last?

How long does immunity from influenza vaccine last? Protection from influenza vaccine is thought to persist for at least 6 months. Protection declines over time because of waning antibody levels and because of changes in circulating influenza viruses from year to year.

What are the ingredients in the flu shot 2020?

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What’s in a flu shot?

  • Egg protein. Many flu vaccines are made by growing the viruses inside fertilized chicken eggs.
  • Preservatives. Vaccine manufacturers add the preservative thimerosal to multidose vaccine vials.
  • Stabilizers.
  • Antibiotics.
  • Polysorbate 80.
  • Formaldehyde.

What is different about the over 65 flu shot?

In response to a regular flu shot, older people produce 50\% to 75\% fewer antibodies, which protect against the vaccine antigens, than do younger adults. Studies have found higher antibody levels in older adults who received high-dose flu vaccines than in those who received standard-dose flu vaccines.

Can you still get a cold after flu shot?

Flu vaccination offers protection against flu virus — and it’s the most effective way to prevent the flu — but you can still get sick even after vaccination.

Do seniors get a stronger flu shot?

The senior flu shot creates a stronger immune response that helps older adults’ immune systems fight the flu virus more effectively than the regular flu shot. The vaccine works by stimulating the production of antibodies that protect seniors against the virus.

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Can you still get Covid after vaccine?

Most people who get COVID-19 are unvaccinated. However, since vaccines are not 100\% effective at preventing infection, some people who are fully vaccinated will still get COVID-19. An infection of a fully vaccinated person is referred to as a “vaccine breakthrough infection.”