Table 2.

Effect of Endometrial Microbiota on ART Outcome.

Parameter	Outcome * [Reference]	No Effect Author [Reference]	Positive Correlation Author [Reference]	Negative Correlation Author [Reference]
High richness of species	On-going pregnancy	Franasiak et al. [27] Moreno et al. [31]
High diversity		Franasiak et al. [27] Moreno et al. [31]
High % of Lactobacillus sp.**	On-going pregnancy [33,34,35] Live birth rate [33,35,48] Miscarriage [34]	Franasiak et al. [27] Kyono et al. [34] # Hashimoto et al. [49] $	Moreno et al. [31] (# or $) Kyono et al. [34] $ Moore et al. [48]	Tao et al. [33] # Riganelli et al. [50]
Bifidobacterium sp. **	On-going pregnancy [34]	Kyono et al. [34] # Hashimoto et al. [49] $	Kyono et al. [34] (≥80%)
Gardnerella sp.		Hashimoto et al. [49]		Moreno et al. [35] Kitaya et al. [51]
Streptococcus sp.		Hashimoto et al. [49]		Moreno et al. [35]
Atopobium sp.		Hashimoto et al. [49]
Flavobacterium sp.		Franasiak et al. [27]
Pseudomonas sp.			Franasiak et al. [27]
Acinetobacter sp.			Franasiak et al. [27]
Burkholderia sp.	RIF [51]			Kitaya et al. [51]
Kocuria dechangensis				Riganelli et al. [50]

sp. = Species, RIF = Recurrent implantation failure. * All studies included pregnancy rate/implantation rate/chemical pregnancy. Thus, any additional outcomes are mentioned here. ** Cut-off ≥ 90% = #, cut-off value ≥ 80% = $.