A highly infectious variant of COVID-19 that has spread around the world since it was first discovered in Britain late last year is between 30% and 100% more deadly than previous strains, researchers said on Wednesday.
In a study that compared death rates among people in Britain infected with the new SARS-CoV-2 variant, known as B.1.1.7, against those infected with other strains, scientists said the new variant had "significantly higher" mortality.
The B.1.1.7 variant was first detected in Britain in September 2020, and has since been found in more than 100 countries.

