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. 2020 Apr 22;11:604. doi: 10.3389/fmicb.2020.00604

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Copyright © 2020 Song, Oh, Kim, Park and Shin.

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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Phylogenetic tree of cefotaxime-resistant Escherichia coli isolates from chickens, pigs, and cattle. The maximum likelihood phylogenetic tree was constructed using Mega X software based on the seven housekeeping genes (adk, fumC, gyrB, icd, mdh, purA, and recA) and Kimura’s 2-parameter model. Bootstrap support percentages (1,000 replicates) were indicated in the different branches. Scale bar at the bottom represents the genetic distance. The phylogroup and sequence type (ST) of each isolate were displayed. Black, gray, and white squares represent chicken, pig, and cattle, respectively. ND, not determined ST.