Genomic Surveillance for SARS-CoV-2 Variants: Circulation ... - ISS-G20 Laboratorium Repository

Weekly estimates of variant proportions during January 2, 2022–May 13, 2023, identified the emergence and subsequent predominance of multiple Omicron lineages in the United States, including BA.2, BA.2.12.1, BA.5, and XBB.1.5. Repeated independent substitutions in the spike protein suggested convergent evolution related to immune evasion. Analytic methods for variant proportion estimation have been updated as numbers of cases and sequenced specimens have declined.

Entire content available on: https://www.cdc.gov/mmwr/volumes/72/wr/mm7224a2.htm