Introduction
microecological disorder
BACTERIAL VAGINOSIS, VAGINA, DISEASE
Bacterial vaginosis (BV) is a microecological disorder caused by decreased abundance of lactobacilli and an increased abundance of anaerobic bacteria, commonly affecting the female lower genital tract (16S rRNA amplicon sequencing technology has been widely used to characterize the microbiome of the vagina in healthy or BV states (Metronidazole (MET) has been recommended by the Centers for Disease Control and Prevention as a treatment method for BV (The probiotic strains used in this study are 