SRP341397 PRJNA771346 Differences in microbial profile of endometrial fluid and tissue samples in women with IVF failure The endometrial microbiota has been linked to several gynecological disorders, including infertility. It has been shown that the microbial profile of endometrium could have a role in fertilization and pregnancy outcomes. In this study we aim to assess the microbial community of endometrial tissue and endometrial fluid samples in women receiving in vitro fertilization treatment. We also search for possible associations between chronic endometritis and endometrial microbiota.