568 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



raffinose, rhamnose, salicin, sorbitol, 

 starch, sucrose, trehalose or xylose. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Distinctive characters : Gas is formed 

 from peptone. Brom cresol purple and 

 phenol red are decolorized in a meat in- 

 fusion broth. 



Source : Two strains isolated from hu- 

 man feces. 



Habitat : Probably intestinal canal of 

 mammals. 



7. Bacteroides inaequalis Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 407; Spherophorus inae- 

 qualis Pr^vot, Ann. Inst. Past., 60, 1938, 

 298.) Fi"om Latin inaequalis, unequal. 



Rods: Wide variation in size and form. 

 Marked pleomorphism on blood agar. 

 Non-motile. Gram-negative. 



Gelatin: Not liquefied in 45 days. 



Blood agar colonies: Pin-point in size. 



Broth: Diffusely clouded. 



Indole is formed. 



Hydrogen sulfide is produced. 



Milk: Acidified but not coagulated. 



Nitrites not produced from nitrates. 



Acid but no gas from esculin, amyg- 

 dalin, arabinose, fructose, galactose, 

 glucose, lactose, maltose, mannose, raffi- 

 nose, salicin, sucrose and xylose. No 

 acid or gas from cellobiose, dextrin, 

 glycerol, glycogen, inulin, mannitol, 

 melezitose, rhamnose, sorbitol, starch 

 and trehalose. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Distinctive characters : Forms small 

 amount (5 per cent in Smith tube) of 

 gas from peptone water in the complete 

 absence of carbohydrates. None of this 

 gas is absorbed by alkali. Rapidly de- 

 colorizes brom cresol purple and phenol 

 red in meat infusion broth; slowly or 

 not at all in peptone water. 



Source : One strain isolated from human 

 feces. 



Habitat: Probably intestinal canal of 

 mammals. 



8. Bacteroides insolitus Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 408; Ristella insolita 

 Prevot, Ann. Inst. Past., 60, 1938, 291.) 

 From Latin insolitus, uncommon. 



Short thick rods: 1.0 to 2.0 microns 

 long. Often slender, curved, 2.0 to 3.0 

 microns long. Non-motile. Gram- 

 negative. 



Gelatin: Not liquefied in 45 days. 



Blood agar colonies: Minute, trans- 

 parent. 



Broth: Heavy, diffuse growth. 



Indole is formed. 



Hydrogen sulfide is formed. 



Milk: Acidified and coagulated in 30 

 to 35 days. 



Nitrites not produced from nitrates. 



Acid but no gas from fructose, galac- 

 tose, glucose, glycerol, lactose, maltose 

 and mannose. No acid or gas from es- 

 culin, amygdalin, arabinose, cellobiose, 

 dextrin, glycogen, inulin, mannitol, melez- 

 itose, raffinose, rhamnose, salicin, sor- 

 bitol, starch, sucrose, trehalose and 

 xylose . 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Distinctive characters: Brom cresol 

 purple and phenol red are rapidly de- 

 colorized in a meat infusion broth. A 

 small amount of gas is formed from pep- 

 tone . 



Source : One strain isolated from human 

 feces. 



Habitat : Probably intestinal canal of 

 mammals. 



9. Bacteroides vescus Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 406; Fusiformis vescus 

 Prdvot, Ann. Inst. Past., 60, 1938, 300.) 

 From Latin vescus, small or weak. 



Slender, pointed rods: 1.0 to 2.0 

 microns long, sometimes slightly curved. 



