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. 2022 Apr 30;836:155599. doi: 10.1016/j.scitotenv.2022.155599

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Fig. 2 — RT-qPCR of SARS-CoV-2 Omicron variant vs. Delta variant in clinical samples. Ct results for 3 genes for COVID-19 positive cases in December 12-13th 2021 (a) and in December 20-21st 2021 (b). RdRP is relevant for all known SARS-CoV-2 variants, while the other two targets are specific to the Delta or Omicron variants. c, Summary of the Delta and Omicron percentage in the tested clinical cases.