Virus variant from South Africa detected in US for 1st time The mutated version of the virus, first identified in South Africa, was found in two cases in South Carolina Loading the player... A new variant of the coronavirus emerged Thursday in the United States, posing yet another public health challenge in a country already losing more than 3,000 people to COVID-19 every day. The mutated version of the virus, first identified in South Africa, was found in two cases in South Carolina. Public health officials said it’s almost certain that there are more infections that have not been identified yet. They are also concerned that this version spreads more easily and that vaccines could be less effective against it.