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A stealthy version of the omicron variant has been detected in the U.S., but so far, it makes up a very low proportion of the overall cases in the country.

This version of the variant, called BA.2, bears some genetic mutations not seen in the original omicron lineage, and some of these mutations lie in the spike protein, according to the World Health Organization (WHO). Some preliminary data hint that BA.2 may be slightly more transmissible, but not more severe, than the original omicron, but it’s too early to interpret that data with any confidence.

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