A total of 20- to 35-year-old women who have been diagnosed with PCOS according to the Rotterdam Criteria and plan to undergo IVF–FET will be recruited. Quick screening of the abundance of Lactobacillus spp. will be performed by real-time quantitative polymerase chain reaction (RT–qPCR), which will be specified later. Women with PCOS with Lactobacillus spp. accounting for less than 80% of the vaginal microbiome who volunteer to participate will be eligible for this study.
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