NCIt definition : A species of facultatively anaerobic, Gram positive, rod shaped bacteria in the phylum
Firmicutes. This species is nonmotile, homofermentative, indole negative, produces
vitamin K, lactase and amylase and does not ferment mannitol. L. acidophilus is a
commensal organism of the gastrointestinal tract, mouth and vagina with probiotic
activity.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Lactobacillus acidophilus.;