Guide Note
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.
Fast Facts
- 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
Symptoms
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.1
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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