Article by Ralph Ellis, WebMD

“This year’s flu season started with a twist.

Normally, it starts around October and lasts through March or April, with the A strain of influenza dominating during the early months and the B strain showing up near the end.

But for the 2019-20 flu season, the B strain made a surprise early appearance.

The B strain is less complicated than the A strain and doesn’t change, or mutate, as much, the CDC says. It’s divided into two families, Yamagata and Victoria, with the large majority of American cases being Victoria. Type B flu only affects humans and doesn’t cause pandemics, although it is seen as more dangerous to young children.

Type A has many variations, mutates all the time, and is responsible for flu pandemics. Type A can also infect animals. It’s usually passed from human to human through airborne germs, but animals can pass the illness to humans, with wild birds commonly acting as the hosts for this virus.”

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