Extended Data Fig. 1: Characteristics of new PCR positive episodes over time. | Nature Medicine

Extended Data Fig. 1: Characteristics of new PCR positive episodes over time.

From: Effect of Delta variant on viral burden and vaccine effectiveness against new SARS-CoV-2 infections in the UK

Extended Data Fig. 1

(a) gene positivity pattern overall, (b) gene positivity pattern restricted to episodes with cycle threshold (Ct) <30; (c) and mean Ct value and 95% CI in all positives. Note: analysis among those ≥18 years; ORF1ab + N + S (black) are compatible with wild-type and B.1.617.2 variants (S-gene positive); ORF1ab + N (gray) are compatible with the B.1.1.7 variant (S-gene negative). Those PCR-positives where only a single gene (N or ORF1ab were detected) cannot be classified (vast majority Ct>30). The percentage of PCR-positives with Ct<30 that were ORF1ab + N + S, compatible with B.1.617.2, increased from 6% the week commencing 10 May 2021, to 67% and 92% the weeks starting 17 May and 14 June 2021, respectively. For panel (c), the number of new PCR positive tests in each calendar week are denoted at the top of the graph.

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