Table 2.

Richness estimators, diversity indices, and coverage of bacterial 16S rRNA gene sequences from 2-, 7-, and 30-day-old neonates (the OTU was defined as a ≥95% similarity cutoff).

Sample	No. of sequencesa	OTUs	Richness estimators		Diversity indices		Coverage (%)
			ACE	Chao1	Simpson	Shannon
2-day-old	421	28	67	48	0.440	1.516	96.9
7-day-old	304	17	18	17	0.246	1.891	99.9
30-day-old	352	27	31	29	0.132	2.437	98.5

a – the number of forward-oriented clone inserts (5′-3′) after excluding those of weak quality and suspected chimeras.