Flu A Vs Flu B Which Is Worsening. Influenza a is usually the more common form of the virus and tends to circulate early in the season, while influenza b is normally less common and shows up. It's caused by one of three different viruses, although most serious illness is caused by flu strains a and b.


Flu A Vs Flu B Which Is Worsening

The flu is commonly caused by type a and b influenza strains. Type b flu may cause a less severe reaction than type a flu virus, but occasionally, type b flu can still be.

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