Quick Three Quiz: How well do you know the four major influenza strains?

It’s well-known that COVID-19 pandemic restrictions pretty much quashed the 2020-2021 flu season, with influenza cases falling to never-before-seen lows in the United States.

So little flu circulated, in fact, that some scientists now suspect that one of the major strains of influenza might have gone extinct, for lack of humans to infect.

How well do you know the four major influenza strains? Put your knowledge to the test.

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