COLUMBIA, S.C. (AP) — A new coronavirus variant identified in South Africa has been found in the United States for the first time. South Carolina officials say two such cases have been diagnosed in the state. Viruses mutate constantly, and many variants of the coronavirus are circulating around the globe, but scientists are primarily concerned with three that appear to spread more easily. Other variants first reported in the United Kingdom and Brazil were already confirmed in the U.S. Researchers predicted it was only a matter of time before the variant identified in South Africa reached the United States as well.