7. Symptoms That Might Require a Doctor’s Care


Though you don’t catch the flu from flu shots, some people do have allergic reactions to them. The following allergic reactions would likely occur pretty quickly after receiving the shot. 

  • Wheezing
  • Difficulty breathing
  • Swollen eyes and mouth
  • Hives
  • Weakness
  • Dizziness

If you’ve never had a flu shot before and have some concern about allergic reactions, be prepared for that possibility. Don’t leave the clinic where you received the shot until you’re sure you’re feeling fine. Ask the person who administers the shot what to do if you have any troubling reactions once you get home. Boost your immunity with this Zinc & Elderberry Booster.

6. Who Decides What Flu Shots Are Needed Each Year? 

World Heatlh Organization

Seasonal flu (influenza) vaccines are recommended and manufactured based on the current types of flu strains going around. “All year long, 142 national influenza centers in 113 different countries collect data on the flu viruses impacting the world’s population,” according to a 2016 article from Scientific American.

The current flu strains making people ill are closely monitored, and past vaccinations are considered to combat these strains based on rates of success. These results are then provided to the five World Health Organization Collaborating Centers for Reference and Research on Influenza for further analysis and vaccine testing on actual flu patients. 

5. What Flu Vaccines Are Available for 2020-21?

Flu Shot

After evaluating what 2020-21 flu strains are most likely to circulate around the world, the latest vaccines are made available. Each vaccine is formulated to protect people from contracting either three or four different current flu viruses. Vaccines for three different viruses, called trivalent vaccines, are formulated to protect people from the following flu strains in 2020-21: 

  • A/Guangdong-Maonan/SWL1536/2019 (H1N1)pdm09-like virus (updated)
  • A/Hong Kong/2671/2019 (H3N2)-like virus (updated)
  • B/Washington/02/2019 (B/Victoria lineage)-like virus (updated)

Current vaccines that protect against four total flu viruses (called quadrivalent vaccines) for the 2020-21 flu season could also contain the B/Phuket/3073/2013-like (Yamagata lineage) virus. 



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