Avid-19 wiped out two kinds of seasonal flus.

Yet, during this pandemic, flu cases dropped into historically low value a phenomenon that experts attribute to wearing masks and other precautions in the fight against the new coronavirus.

But what's more interesting, they write foreign media, you know, it's the fact that both types of flu viruses haven't shown up in anyone's <x0).

However, experts do not yet know whether these species have disappeared, but if so, officials can more easily choose species of flu virus involved in the seasonal flu vaccine.

Grid A and Grid B

To explain which flu viruses may have disappeared, we must first understand how flu viruses are classified.

Two families of flu viruses cause seasonal flu: flu A and flu B.

flu viruses A divide into “belowipe” based on two proteins on their surface known as hemaggutinin (H) and neuraminidase (N).

Currently, H1N1 and H3N2 circulates to people, and each of these substipes is divided further into “class”

On the other hand, B flu viruses do not have “belowipe” or “classa”, but are divided into two lines known as B/Yagata and B/Victoria.

A “class” of H3N2, known as 3c3.A, has not been revealed since March 2020. The same goes for the B/Ymagata line, according to STAT.

I think there's a good chance they're gone. But the world is at the end of the day a big place”, says Trevor Bedford, a biologist at Fred Hutchinson Cancer Research Center in Seattle.

While Florian Krammer, a virologist at Icahn School of Medicine Mount Sinai in New York, shared similar thoughts about B/Yagata.

It's just that nobody saw it doesn't mean it's completely gone, does it? But it could have disappeared”, Crammer said.

In this regard, it is estimated that the smallest diversity among flu viruses would be a good thing.

Every year, scientists take a flu vaccine a few months before the flu season actually begins by seeing what species are circulated around the world and then predicting which flu species may be the most common during the coming season.