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Comparison of incidence in the United States of B.1.427/429 and B.1.526.1 in 2021. Spike L452R-bearing SARS-CoV-2 genomes from North America were downloaded from GISAID, and the strain type was confirmed by mutation pattern. Graphed is the proportion of B.1.427/429 versus B.1.526.1 viruses during each 2-week period in 2021.
