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. 2021 Jun 19;562:63–73. doi: 10.1016/j.virol.2021.06.004

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Fig. 2 — DNA sequence chromatograms of PCR amplicons of the SARS-CoV-2 genome indicative of co-infection with two virus strains. Chromatograms that include variant positions with sequences that correspond to the reference sequence and a mutated sequence, and chromatograms of apparently heterozygous status that are suggestive of co-infection are shown. A sequence at V1 with the reference sequence was not observed among the samples sequenced.