Is the R.1 variant in the Bay Area? What to know about the highly mutated COVID strain San Francisco ChronicleCOVID-19 variant R.1 is ‘something really to watch,' researcher says Fox NewsWhat Is the R.1 COVID Variant? Experts Share What It Could Mean for the U.S. Prevention.comNew COVID-19 variant in US contains traces of delta WISHTV.comCovid-19 Vaccines Can Be Updated for the Delta Variant.