FIG 1.

Phylogenetic tree of SARS-CoV-2 from a zooanthroponotic spillover case in Mexico City during 2020. The zooanthroponotic event described here involved two humans and a dog (Canis lupus familiaris) living in a household. The phylogenetic analysis was conducted by maximum likelihood and the general time reversible model, showing the genetic relationship of sequences reported in this study with different divergent clades of SARS-CoV-2 (GISAID classification) and multiple variants described during the pandemic. In addition, results of the comparison between sequences and the reference strain sequence are shown. The analysis involved a total of 31 representative sequences of different clades obtained from the GISAID database (9).