Volume 29, Number 4—April 2023
Research Letter
SARS-CoV-2 Omicron Replacement of Delta as Predominant Variant, Puerto Rico
Figure
![Decline of SARS-CoV-2 Delta variant and emergence of Omicron sublineages BA.1 and BA.2, illustrated by time-calibrated phylogenetic tree inferred with ncov augur/auspice workflow to represent the molecular evolution of the Delta variant in Puerto Rico since October 1, 2021, and subsequent expansion of the Omicron variant through May 30, 2022. Taxa labels are color-coded by geographic region of sampling to present the phylogenetic relatedness of viruses from Puerto Rico (dark blue) to viruses from the United States (light blue) and other regions of the world.](/eid/images/22-1700-F1.jpg)
Figure. Decline of SARS-CoV-2 Delta variant and emergence of Omicron sublineages BA.1 and BA.2, illustrated by time-calibrated phylogenetic tree inferred with ncov augur/auspice workflow to represent the molecular evolution of the Delta variant in Puerto Rico since October 1, 2021, and subsequent expansion of the Omicron variant through May 30, 2022. Taxa labels are color-coded by geographic region of sampling to present the phylogenetic relatedness of viruses from Puerto Rico (dark blue) to viruses from the United States (light blue) and other regions of the world.
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