8 strains of the coronavirus are circling the globe. Here’s what clues they’re giving scientists
SAN FRANCISCO — At least eight strains of the coronavirus are making their way around the globe, creating a trail of death and disease that scientists are tracking by their genetic footprints. https://www.usatoday.com/story/news/nation/2020/03/27/scientists-track-coronavirus-strains-mutation/5080571002/