The specific type typically doesn't show up until springtime.
What exactly is influenza B—and how is it different than influenza A?
Going a little deeper, influenza A and B viruses are each divided into different subtypes. Influenza A viruses are the trickiest: They're divided into subtypes based on two specific proteins, hemagglutinin and neuraminidase —ultimately, influenza A viruses can broken down into 198 different subtype combinations, per the CDC. Influenza B viruses, however, are classified into two lineages: B/Yamagata and B/Victoria.influenza A, hitting later in the season around springtime.
Another key difference between influenza A and B? While influenza B viruses are typically less common than influenza A viruses, influenza B infections can be more severe in children, and can lead to complications that require hospitalization or death., the best way to prevent the flu—both influenza A and B—is by getting the flu vaccine. And no, it isn’t too late in the season.
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