Viruses, it turns out, can block one another and take turns to dominate.
has not definitively detected the B/Yamagata flu strain since March 2020. “I don’t think anyone is going to stick their neck out and say it’s gone just yet,” says Richard Webby, a virologist at St. Jude Children’s Research Hospital in Memphis. But, he adds, “we hope it got squeezed out.” Such an extinction would be a super rare event, Webby says.
Viral interference can happen in individual cells in the lab, and in individual animals and people that are exposed to multiple viruses — but it can also play out across entire populations, if enough people get one virus for it to hinder the flourishing of others at scale. This results in waves of infections by individual viruses that take turns to dominate. “Looking back over the past couple of years, I’m pretty confident in saying that Covid can certainly block flu and RSV,” Webby says.
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