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. 2021 Jul 20;12:712707. doi: 10.3389/fmicb.2021.712707

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Copyright © 2021 Cheng, Yang, Cao, Liu, Li, Sun, Li, Ishfaq and Zhang.

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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Analysis of phylogroup, antimicrobial resistance genes, and relationships among 56 mcr-1-positive E. coli isolates from swine farms in northeastern China. Relationships among 56 mcr-1-positive E. coli isolates are indicated using an unrooted tree based on the alignments of concatenated MLST allelic sequences using the neighbor-joining method. For comparison of resistance genes among the 56 mcr-1-positive E. coli isolates, the red squares represent positivity for antimicrobial resistance genes.