As the U.S marks the deaths of more than 400,000 Americans from COVID-19, mutations of the virus are rapidly popping up across the country. So far, vaccines seem to be effective against the new variants. David Begnaud reports.
As the U.S marks the deaths of more than 400,000 Americans from COVID-19, mutations of the virus are rapidly popping up across the country. So far, vaccines seem to be effective against the new variants. David Begnaud reports.