Does the endometrial cavity have a molecular microbial signature?

Recent molecular studies concluded that the human endometrium has a resident microbiota dominated by Lactobacillus spp., similar to the vagina microbiota. However, these findings were primarily derived from endometrial samples obtained through a transcervical catheter and thus prone to contamination from the vaginal microbiota. Therefore, the existence of a resident endometrial microbiota and its structure, if indeed present, remains unknown.