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. 2017 Jul 21;8:1388. doi: 10.3389/fmicb.2017.01388

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Copyright © 2017 Nagpal, Tsuji, Takahashi, Nomoto, Kawashima, Nagata and Yamashiro.

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) or licensor 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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Proportional ratios of obligatory anaerobic vs. facultative anaerobic bacteria averaged (A) and at individual-level (B) in healthy Japanese infants (n = 19) at different time-points during the first 3 years of life. Proportions were calculated by using the original arithmetical number of the bacterial count and are expressed as the percent of the total fecal bacterial count. Obligates: Clostridium coccoides group, Clostridium leptum subgroup, Bacteroides fragilis group, Bifidobacterium, Atopobium cluster, Prevotella and Clostridium perfringens. Facultatives: Enterobacteriaceae, Enterococcus, Lactobacillus, and Staphylococcus. Age: 1 day, 7 days, 1 month, 3 months, 6 months, 3 years.