Positive saliva means positive sialidase, a clinical indicator used to diagnose the presence of a bacterial vaginal infection, and positive indicates the presence of a bacterial infection. Vaginal bacterial infections may exist after low immunity of the organism or unclean sex. Dominant pathogenic bacteria proliferate, especially Gardnerella and anaerobic infections, which produce salivary acid glycosidase, leading to a positive salivary acid glycosidase, which is an indicator for the diagnosis of vaginal bacterial infections. Positive salivary acid glycosidase should promptly seek medical attention, standardized medication under the guidance of the doctor, can use metronidazole, lactobacillus suppositories and so on. Sexual intercourse should be prohibited during the use of medication, and the vaginal environment should be kept hygienic. Eat a light diet and avoid spicy and stimulating foods.