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The South African variant, or B.1.351, has already spread rapidly on the African continent and has been observed in at least 24 countries outside of Africa. It was found in the United States this week in two cases in South Carolina. Meanwhile, a highly transmissible variant originating in the United Kingdom, which first surfaced on December 29 in the United States, has spread to 29 states in less than a month, and health officials Americans warn that it could quickly become dominant.
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