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. 2022 May 10;10:862157. doi: 10.3389/fped.2022.862157

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Copyright © 2022 Xu, Yu, Liu, Tan and He.

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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Diversity and composition of the airway microbiome. (A) Shannon index at birth (Day 1); (B) Shannon index on Day 7 after birth (a greater Shannon index is indicative of higher microbial diversity); (C) Principal coordinate analysis (PCoA) of microbial communities at birth (Day 1); (D) PCoA of microbial communities on Day 7 after birth (samples near to each other have similar microbial composition, while samples far from each other have distinct microbial composition); (E,F) Relative abundance of bacterial phyla (E stands for day 1 after birth, F stands for day 7 after birth). (G,H) Relative abundance of bacterial genera (G stands for day 1 after birth, H stands for day 7 after birth). (On day 1, the number of infants with severe BPD, moderate BPD, mild BPD and non-BPD was 7, 5, 9, and 4, respectively. On day 7, the number of babies was 4, 4, 4, and 3, respectively. On day 7, some specimens were missing).