432 



ORDER IV. EUBACTERIALES 



ex.i'gu.us. L. adj. exiguus small and 

 narrow. 



Very small, slender rods, 0.5 to 1.0 micron 

 long, occurring singly and in pairs. Non- 

 motile. Gram-negative. 



Gelatin: Liquefaction in 16 to 20 days. 



Blood agar colonies: These are of two 

 types: one is pin-point in size, the other is 

 large, gray, moist and 1.0 to 1.5 mm in 

 diameter. 



Broth: Diffusely clouded. 



Milk: Acidified and may or may not be 

 coagulated in 35 to 40 days. 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid but no gas from fructose, galactose, 

 glucose, lactose, maltose, mannose, sucrose 

 and trehalose. One strain ferments raffinose. 

 No acid or gas from esculin, amygdalin, 

 arabinose, cellobiose, dextrin, glycerol, 

 glycogen, inulin, mannitol, melezitose, 

 rhamnose, salicin, sorbitol, starch or xylose. 



Nitrites not produced from nitrates. 



Peptone: No gas. 



Anaerobic. 



Non-pathogenic for white mice or rabbits. 



Source: Two strains were isolated from 

 human feces. 



Habitat: Probably the intestinal canals 

 of mammals. 



19. Bacteroides uniformis Eggerth and 

 Gagnon, 1933. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 400; Rislella uniformis 

 Pr^vot, Ann. Inst. Past., 60, 1938, 291.) 



u.ni.for'mis. L. adj. uniformis of a single 

 form. 



Small rods, 0.8 to 1.5 microns long, with 

 rounded ends, occurring singly. Non-motile. 

 Stain heavier at poles and around periphery. 

 Gram-negative. 



Gelatin: Liquefaction by two strains in 

 15 to 40 days. No liquefaction by six strains. 



Blood agar colonies: Transparent, soft, 

 elevated, 0.5 to 0.75 mm in diameter. 



Broth: Diffuse growth. 



Milk: Acidified and coagulated in 8 to 12 

 days. 



Indole is produced. 



Hydrogen sulfide produced slowly or not 

 at all. 



Acid but no gas from esculin, amygdalin, 

 arabinose, cellobiose, dextrin, fructose, 



galactose, glucose, glycogen, inulin, lactose, 

 maltose, mannose, melezitose, raffinose, 

 salicin, starch, sucrose, trehalose and 

 xylose. No acid or gas from glycerol, manni- 

 tol, rhamnose, sorbitol, dulcitol, erythritol 

 or inositol. 



Nitrites not produced from nitrates. 



Peptone: No gas. 



Anaerobic. 



Non-pathogenic for white mice or rabbits. 



Distinctive characters: Produces indole. 

 Resembles Bacteroides vulgatus. 



Source: Eight strains were isolated from 

 human feces. 



Habitat: Probably the intestinal canals 

 of mammals. 



20. Bacteroides vulgatus Eggerth and 

 Gagnon, 1933. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 401; Pasteurella vulgata 

 Prevot, Ann. Inst. Past., 60, 1938, 292.) 



vul.ga'tus. L. adj. vulgatus common. 



Ellipsoidal rods, 0.7 to 2.5 microns long, 

 usually occurring singly, sometimes in pairs; 

 one strain forms filaments 10.0 microns long. 

 Morphology very variable in glucose broth. 

 Non-motile. Stain solidly, although some 

 strains show bipolar staining. Gram-nega- 

 tive. 



Gelatin: Liquefaction in 4 to 20 days by 

 all but one strain. 



Blood agar colonies: Soft, translucent, 

 grayish, elevated, 1.5 to 2.0 mm in diam- 

 eter. Half of the strains are hemolytic. 



Broth: Heavy and diffuse growth. 



Milk: Acidified. Coagulated by some 

 strains in 5 to 25 days. 



Indole not produced. 



Hydrogen sulfide is produced. 



Acid and a small amount of gas from 

 arabinose, dextrin, fructose, galactose, 

 glucose, glycogen, inulin, lactose, maltose, 

 mannose, raffinose, rhamnose, starch, su- 

 crose and xylose. Seven strains fermented 

 esculin. No acid or gas from amygdalin, 

 cellobiose, glycerol, mannitol, melezitose, 

 salicin, sorbitol, trehalose, dulcitol, erythri- 

 tol or inositol. 



Nitrites not produced from nitrates. 



Anaerobic. 



Non-pathogenic for white mice or rabbits. 



Distinctive characters: Does not form 

 indole; does not produce gas from peptone. 



