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Of all the coronavirus variants, scientists are most concerned about these 3 strains – OregonLive

Monitoring variants is important because of the possibility that they could make vaccines and treatments less effective, or change the way they infect people.

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There are many variants of the coronavirus circulating around the world, but health experts are primarily concerned with the emergence of three variants first detected in the United Kingdom, South Africa and Brazil. They seem to spread more easily and research is underway to see if they cause more serious disease.
As a virus infects people, it can mutate as it makes copies of itself. Some mutations can be harmful to a virus, causing it to die out. Others can offer an advantage and help it spread.

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