claim: in a phylogenetic network analysis of six complete human severe acute respiratory syndrome coronavirus 2 genomes, we find three central variants distinguished by amino acid changes, which we have named a, b, and c...
evidence_1: to understand the evolution of this virus within humans, and to assist in tracing infection pathways and designing preventive strategies, we here present a phylogenetic network of 160 largely complete sars-cov-2 genomes (fig.