[4][5][6] A stable colonization with these species, as opposed to dominantly L. iners, is associated with better reproductive outcomes, e.g. a decreased rate of preterm birth.

Although sharing many characterization criteria, L. jensenii differed from the similar Lactobacillus leichmannii in a gel electrophoresis analysis of their respective lactic dehydrogenases.

[7] The species was named in honour of Sigurd Orla-Jensen, a Danish microbiologist and a pioneer of biotechnology.

Lactobacillus jensenii is Gram-positive, rod-shaped, negative for catalase and oxidase, and anaerobic.

[8] Bloodstream infection by Lactobacilli is rare but often fatal, with 30% of endocarditis cases caused by the genus resulting in patient mortality.