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. 2019 Aug 5;9:274. doi: 10.3389/fcimb.2019.00274

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Copyright © 2019 Jiang, Amemura-Maekawa, Ren, Li, Sakata, Zhou, Murai, Chang, Ohnishi and Qin.

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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Minimum spanning tree analysis of 616 L. pneumophila serogroup 1 strains isolated in Japan and China. STs are shown as circles. The size of each circle indicates the number of isolates within this particular type. The 616 L. pneumophila serogroup 1 strains were divided into groups by countries and sources (A), lag-1 alleles (B), and Distribution of ORF 7 and ORF 8 genes of LPS (C).