FAMILY PARVOBACTERIACEAE 



567 



Acid and gas from fructose, glucose and 

 maltose. Some strains ferment man- 

 nitol, sucrose and lactose. 



Anaerobic. 



Optimum temperature 37 °C. 



Experimental pathogenicity : Some 

 strains are pathogenic for rabbits and 

 guinea pigs Init not for white rats and 

 mice. 



Source and habitat: Female genitalia, 

 urinary infections, puerperal infections, 

 acute appendicitis, otitis, pulmonary 

 gangrene, liver abscesses, septicaemias 

 and intestinal tract. 



4. Bacteroides siccus Eggerthand Gag- 

 non. (Eggerth and Gagnon, Jour. Bact., 

 25, 1933, 410; Spherophorus siccus Prevot, 

 Ann. Inst. Past., 60, 1938, 299.) From 

 Latin siccus, dry. 



Short, thick rods: About 1.0 micron 

 long. In glucose broth they are coccoid 

 and often grow in short chains. Non- 

 motile. Gram-negative. 



Gelatin: Xot liquefied. 



Blood agar colonies: Elevated, dry, 

 difficult to emulsify, 1.0 to 1.5 mm in 

 diameter. 



Broth: Growth occurs as a powdery 

 sediment with a clear supernatant fluid. 



Indole not formed. 



Hj'drogen sulfide is formed. 



Milk: Unchanged. 



Nitrites not produced from nitrates. 



Acid but no gas from fructose. No acid 

 or gas from glucose, glycerol, mannitol, 

 sorbitol, arabinose, saliein, trehalose, 

 amygdalin, cellobiose, glj'^cogen, rham- 

 nose, xylose or lactose. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Distinctive characters: Gas is formed 

 in small amounts from peptone. Phenol 

 red and brom cresol purple are de- 

 colorized in meat infusion broth. 



Source : Two strains isolated from 

 human feces. 



Habitat: Probably intestinal canal of 

 mammals. 



5. Bacteroides coagulans Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 409 ; Pasteur ella coagulans 

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

 From Latin coagulans, coagulating. 



Rods : 0.5 to 2.0 microns long. Bipolar 

 staining. Non-motile. Gram-negative. 



Gelatin: Liquefied in 8 to 12 days. 



Blood agar colonies: Soft, transparent, 

 0.5 mm in diameter. 



Broth : Diffuse growth. 



Indole is formed. 



Hydrogen sulfide is formed. 



Milk: Coagulated in 8 days without 

 acid production. The coagulum partly 

 redissolves after 3 to 4 weeks. 



Nitrites not produced from nitrates. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Distinctive characters : No acid or gas 

 from carbohydrates. A small amount 

 of gas is formed from peptone. Phenol 

 red and brom cresol purple are de- 

 colorized in a meat infusion broth. 



Source : One strain isolated from 

 human feces. 



Habitat : Probably intestinal canal of 

 mammals. 



6. Bacteroides varius Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 409; Spherophorus varius 

 Prevot, Ann. Inst. Past., 60, 1938, 299.) 

 From Latin varius, diverse. 



Rods : 1 .0 to 3.0 microns long. Staining 

 uneven. Non-motile. Gram-negative. 



Gelatin: Not liquefied in 45 daj's. 



Blood agar colonies: Very flat cones, 

 2.0 to 3.0 mm in diameter. 



Broth: Diffusely clouded. 



Indole is formed. 



Hydrogen sulfide produced. 



Milk: Not acidified or coagulated. 



Nitrites not produced from nitrates. 



Acid and gas from fructose, galactose, 

 glucose and mannose. No acid or gas 

 from esculin, amygdalin, arabinose, cello- 

 biose, dextrin, glycerol, glycogen, inulin, 

 lactose, maltose, mannitol, melezitose, 



