TABLE 3.

Lactobacillus species commonly detected in human feces, saliva, and food

Species	Fecesa	Oral cavity	Food
L. acidophilus	+	+
L. crispatus	+ (P)	+
L. gasseri	+ (P)	+
L. johnsonii	+		+
L. salivarius	+ (P)	+
L. ruminis	+ (P)
L. casei	+	+	+
L. paracasei	+	+	+
L. rhamnosus	+	+	+
L. plantarum	+	+	+
L. reuteri	+ (P)		(+)b
L. fermentum	+	+	+
L. brevis	+	+	+
L. delbrueckii	+		+
L. sakei	+		+
L. vaginalis	+	+
L. curvatus	+		+

^aP indicates species that were reported to persist in some human subjects (62, 72, 96).

^bL. reuteri can be found regularly only in sourdough and in other fermented cereals such as fermented oatmeal. Fecal isolates of these species are therefore unlikely to originate from food.