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Effective reproduction number for variants of SARS-CoV-2. Each row of graphs shows different variants within a given country (from top to bottom: South Africa, the United States, and Canada). The columns show results for particular variants (from left to right: variants other than Delta and Omicron, the Delta variant, the Omicron variant). The 95% CIs are plotted in magenta. CI, confidence interval; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
