DETROIT – Michigan health officials are tracking a confirmed case of the more contagious South African variant of COVID-19. READ: Everything we know about virus variants in Michigan, USWhat is the South African variant? The B117 variant of the coronavirus appears to be at least 50 percent more transmissible. One particular mutation in the B117 variant, known as the N501Y, has already been found in other variants across the world. READ: Michigan confirms first case of South African COVID variant in Jackson CountyRead more: