Flu B Is Dominating Flu Season: Learn the Difference Between Flu A & Flu B (and Why It Matters) by Sophia L. Thomas, DNP, APRN, FNP-BC, PPCNP-BC, FNAP, FAANP

Family Health
2 years ago
Flu B Is Dominating Flu Season: Learn the Difference Between Flu A & Flu B (and Why It Matters)

Flu season is still raging on, but this year, there is a twist. Typically Flu A dominates early in the season, and then as spring approaches, Flu B makes a final push. This year, for the first time in 30 years, Flu B is making headlines. What’s the difference and why does this matter?

Flu A

  • Very contagious.
  • Typical flu symptoms.
  • Mutates quickly, very little immunity.
  • Global outbreaks (pandemics).
  • Causes severe illness. 
  • 75 percent of cases.
  • Protected by flu shot.


  • Very contagious.
  • Typical flu symptoms.
  • Mutates slowly, more immunity in adults.
  • More regional outbreaks (epidemics).
  • Causes severe illness, dangerous for kids.
  • 25 percent of cases.
  • Protected by flu shot.

While Flu B doesn’t cause global hysteria, it’s potentially more dangerous for kids. This year we’ve seen the most pediatric deaths since the Centers for Disease Control & Prevention (CDC) began tracking it 17 years ago, and Flu B is mostly to blame. Additionally, Flu A is gaining a still head of steam, which could make this flu season worse than expected. 

The bottom line: All flu strains are dangerous, and we’re nowhere near the end of the season. If you haven’t gotten a flu shot yet, it’s not too late!

The information on 30Seconds.com is for informational and entertainment purposes only, and should not be considered medical advice. The information provided through this site should not be used to diagnose or treat a health problem or disease, and is not a substitute for professional care. Always consult your personal healthcare provider.

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Julie Rose
How scary. We need to give flu more respect!
Elisa A. Schmitz 30Seconds
I didn't know this about Flu B, though I know it is coming on strong right now. Thank you for sharing this important info, Sophia L. Thomas, DNP, APRN, FNP-BC, PPCNP-BC, FNAP, FAANP !
Gwen Johnson
I had no idea the differences between A and B. Thanks for sharing! Sophia L. Thomas, DNP, APRN, FNP-BC, PPCNP-BC, FNAP, FAANP

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