EVERYDAY SCIENCE / “We first had the alpha variant, then delta and now omicron. Each time, it seems the previous strain has been wiped off the map — omicron would now account for almost all cases in Quebec. I would like to understand the mechanism at play that causes these new strains to eliminate the previous one. Unless they are still circulating, but just a little? How would the propagation of omicron prevent the previous strains from circulating?” asks Thierry Salvet, from Montreal.
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