Lactobacillus iners is a species in the genus Lactobacillus. It is a Gram-positive, catalase-negative, facultatively anaerobic rod-shaped bacterium. Lactobacillus iners is a normal inhabitant of the lower reproductive tract in healthy women. L. iners has an unusually small genome, indicative of a symbiotic or parasitic lifestyle. The genome of L. iners strains encodes inerolysin, a pore-forming toxin related to vaginolysin of Gardnerella vaginalis.