Figure 2.

Distribution of sample type-specific operational taxonomic units (OTUs). (a) Types of OTUs that were found exclusively in one sample group. (b) Venn diagram showing common species between sample types, despite they were indeed assigned to different OTUs. The amniotic fluid-maternal feces, amniotic fluid-vaginal fluid, and amniotic fluid-meconium sample pairs shared eleven, three, and two common species, as listed (Table S2 for complete data). This analysis only included OTUs that were detected in more than two samples of the same sample group. IF: meconium; AF: amniotic fluid; MF: maternal feces; MS: maternal saliva; MV: vaginal fluid.