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A second version of omicron is spreading. Here's why scientists are on alert



A computer-generated image of the omicron variant of the coronavirus.

It’s a sibling of the first omicron variant that swept the world. Is it more contagious? Does it cause severe disease? Will it keep current omicron surges going? Researchers are looking for answers.

(Image credit: Uma Shankar Sharma/Getty Images)





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