Infections with ‘U.K Variant’ B.1.1.7 Have Greater Risk of Mortality – NIH Director's Blog

Based on this evidence, the researchers calculated the risk of death associated with B.1.1.7 infection. Their estimates suggest that B.1.1.7 infection was associated with 55 percent greater mortality compared to other SARS-CoV-2 variants over this time period.

https://directorsblog.nih.gov/2021/03/30/infections-with-u-k-variant-b-1-1-7-have-greater-risk-of-mortality/