Newly identified US variant may have emerged in May, study indicates
A newly identified variant of the virus that causes COVID-19 may have emerged in the U.S. in May and could be one of the predominant versions circulating now, researchers at Southern Illinois University found.
Just because a new variant has emerged doesn't mean it's inherently dangerous, experts cautioned. It’s unknown if this new U.S. variant is more transmissible and deadly, but scientists say they are monitoring and continuing to study newly emerging viral variants. On Wednesday, researchers at Ohio State reported two newly identified ones. On Thursday, researchers at Southern Illinois University said they also identified a new variant, which is likely the same as the two identified in Ohio.
Now, researchers at Southern Illinois University are sharing even more details about this U.S. variant, which they are calling 20C-US. Origins of this variant can be traced to May 2020 from a sample in Texas, they said.
The 20C-US variant appears to be widespread in the Upper Midwest and comprises roughly 50% of the samples in the U.S., said Keith T. Gagnon, coauthor of the study and associate professor at Southern Illinois University.
"Let’s not get overly excited -- but be diligent," Gagon said. "Here it was, underneath our noses, for months."
“It doesn't look like it’s going to get in the way of vaccines," Gagnon added.
ABC News’ Sean Llewellyn, Eric Strauss and Sony Salzman contributed to this report.