Fig. 2

Phylogenetic validation of co-infection candidates. Phylogenetic tree including the sequences from segregated co-infecting strains and sequences obtained from all SARS-CoV-2 cases diagnosed 4 weeks before and after diagnosis of the candidate for co-infection (scale bar: substitutions per site). We present two representative examples of a an epidemiologically inconsistent case (patient 55 in Additional file 1: Table S4). The two segregated sequences from the co-infected candidate were located closer to each other, including sharing the same branch, than to any other circulating strain, and b an epidemiologically consistent case (patient 2 in Additional file 1: Table S4). The two segregated sequences are interspersed on the tree. Majority- and minority-segregated strains are represented by a black dot in a red circle