Influenza B

    • Easier to catch in fall and winter
    • Evolves slower than A and faster than C influenzas
    • Resistant to treatment
    • Cause morbidity and mortality in humans
    • Recovery time usually 1 to 2 weeks
  • Influenza B is an influenza virus that produces milder symptoms than influenza A when it infects humans. Influenza B may occur in epidemic, but it is not a pandemic flu concern.

    While it mutates two to three times slower than influenza A, it is still too fast for a person to build a lasting immunity to it.

    To date, influenza B is only known to cause infection in seals and humans.

  • Controversy

    In 2008, according to the Centers for Disease Control and Prevention, the flu shot created did not match the circulating influenza B viruses. While the flu shot for the 2008 season contained a influenza B component, it was not part of the Yamagata lineage which made up 93 percent of the influenza B viruses going around.CIDRAP: CDC says influenza B strain doesn't match vaccine (February 8, 2008)
  • Disclaimer

    The content in this page is not a substitute for professional medical advice. If you think you are infected with influenza B, please consult your doctor.

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