AD Iuliano, JM Brunkard, TK Boehmer… - … and Mortality Weekly …, 2022 - ncbi.nlm.nih.gov
The B. 1.1. 529 (Omicron) variant of SARS-CoV-2, the virus that causes COVID-19, was first
clinically identified in the United States on December 1, 2021, and spread rapidly. By late …