The coronavirus variants circulating globally are projected to become more dominant in the United States by the spring, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said during a White House news briefing.
"The fact is, when you have a virus that has ability to transmit more efficiently than the wild type in the community — sooner or later, by pure viral dynamics itself — it will become more dominant than the wild type," Fauci said.
"We have a situation where there have now been reported in very specific places, in South Carolina for example, the isolate or the mutant that is the 351 [B.1.351, the Covid-19 variant first spotted in South Africa]," Fauci said. "That seems to have a very good fitness for spread, so whether or not that's going to ultimately take over in the sense of being dominant is unclear by now. The projection that is made with regard to the UK [variant] is that probably by the end of March, the beginning of April, it actually will become more dominant in this country."