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. 2020 Jul 24;11:1795. doi: 10.3389/fmicb.2020.01795

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Copyright © 2020 Mordecai and Hewson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Phylogeny of representative Nidovirales based on ORF1a (replicase) amino acid sequences. Closely related sequences were removed. Tip points are colored by ecosystem and shaped by host. The clade highlighted in red shows the phylogenetic placement of SARS-CoV-2 and closely related viruses. Branches are scaled to the number of amino acid substitutions per site and the tree is mid-point rooted. Node values show FastTree support values (ranging from 0 to 1). Amino acid alignments were carried out using MAFFT (Katoh and Standley, 2013) the tree was built using FastTree (Price et al., 2010) and visualized using ggtree (Yu et al., 2017).