Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Lactobacillaceae, Genus Lactobacillus, Lactobacillus minutus
(Hauduroy et al. 1937) Moore and Holdeman 1972, emend. Olsen, Johnson, Moore and Moore, 1991.
Homotypic synonyms: Atopobium minutum (Hauduroy et al. 1937) Collins and Wallbanks 1993, Bacteroides minutum Hauduroy et al.
Gram-positive small (0.6-1.0 x 0.8-3.0 µm), elliptical, rods, occurring singly, in pairs and
in short chains. Non-motile.
Colonies are raised or low convex, translucent to transparent, grey, light yellow or
white, pinpoint to 1 mm in diameter after 5 days of anaerobic incubation at 37 ºC on
BH blood agar. Growth is stimulated by 0.02% Tween 80 and may be stimulated by
10% rabbit serum. Variable growth at 45 ºC. Optimum growth at 37 ºC. Variable
growth in 6.5% NaCl. Strict anaerobic.
Isolated from human clinical samples.
Undetermined. Isolated from blood, abdominal wounds, pelvic abscesses and similar human infections.
- Olsen I, Johnson JL, Moore LVH and Moore WEC, 1991. Lactobacillus uli sp. nov. and Lactobacillus rimae sp. nov. from the
human gingival crevice and emended descriptions of Lactobacillus minutus and Streptococcus parvulus. Int J Syst Bacteriol 41,
Positive results for ammonia produced from arginine and fermentation of glucose.
Negative results for catalase, gelatin liquefaction, hippurate hydrolysis, indole production, nitrate reduction, fermentation of amygdalin,
arabinose, cellobiose, erythritol, esculin, glycerol, inositol, inulin, lactose, maltose, mannitol, melezitose, melibiose, raffinose,
rhamnose, ribose, salicin, sorbitol, starch, sucrose, trehalose and xylose.
Variable results for esculin hydrolysis, fermentation of fructose and mannose.
(c) Costin Stoica