FAMILY PARVOBACTERIACEAE 



571 



Broth: Growth is diffuse. 



Indole not formed. 



Hydrogen sulfide is produced. 



Milk: Acidified. All but 4 strains 

 coagulate milk. 



Nitrites not produced from nitrates. 



Peptone : No gas. 



Acid but no gas from amygdalin, 

 cellobiose, dextrin, fructose, galactose, 

 glucose, inulin, lactose, maltose, man- 

 nose, melezitose, raffinose, rhamnose, 

 salicin, sucrose, trehalose and xylose. 

 Fifteen strains ferment esculin. Fifteen 

 strains slowly ferment starch. No acid 

 or gas from arabinose, glycogen, glycerol, 

 mannitol or sorbitol. 



Non-pathogenic for white mice and rab- 

 bits. 



Anaerobic. 



Distinctive characters: Usually fails 

 to liquefy gelatin. Fails to ferment 

 arabinose . 



Source : Twenty strains isolated from 

 human feces. 



Habitat : Probably intestinal canal of 

 mammals. 



15. Bacteroides tumidus Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 2o, 1933, 405; Ristella tumida 

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

 From Latin tumidus, swollen. 



Small, thick oval rods: 1.0 to 1.5 

 microns long and occurring singly. The 

 staining is solid. On glucose broth many 

 swollen forms with irregular staining 

 from 1.0 to 4.0 by 1.5 to 10 microns. 

 The bodies of these swollen forms are 

 usually very pale, with only the ends 

 staining. Non-motile. Gram-negative. 



Gelatin: Liquefied in 12 to 20 daj^s. 



Blood agar colonies: Soft, grayish, 

 elevated colonies, 1 mm in diameter. 



Broth: Heavy, diffuse growth. 



Indole not formed. 



Hydrogen sulfide is produced. 



Milk: Acidified but not coagulated. 



Nitrites not produced from nitrates. 



Peptone : No gas. 



Acid but no gas from dextrin, fruc- 



tose, galactose, glucose, glycogen, inulin, 

 lactose, maltose, mannose, raffinose, sor- 

 bitol, starch and sucrose. No acid or 

 gas from esculin, amygdalin, arabinose, 

 cellobiose, glycerol, mannitol, melezitose, 

 rhamnose, salicin, trehalose or xylose. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Source : Four strains isolated from 

 human feces. 



Habitat : Probably intestinal canal of 

 manmials, 



16. Bacteroides convexus Eggerth and 

 Gagnon. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 406; Pasteurella convexa 

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

 From Latin convexus, convex. 



Thick, oval rods: 0.8 to 1.5 microns 

 long, occurring singly or in pairs. In 

 glucose broth, the rods are usually 2.0 

 to 3.0 microns long. Non-motile. Gram- 

 negative. 



Gelatin : Liquefied in 20 to 30 days. 



Blood agar colonies: Elevated, grayish, 

 somewhat opaque colonies, 1.0 to 1.5 

 mm in diameter. 



Broth: Heavy diffuse growth. 



Indole not formed. 



Hydrogen sulfide is produced. 



Milk: Acidified and coagulated in 4 

 days. 



Nitrites not produced from nitrates. 



Peptone : No gas. 



Acid and a small amount of gas from 

 esculin, amygdalin, cellobiose, dextrin, 

 fructose, galactose, glucose, glycogen, 

 inulin, lactose, maltose, mannose, raffi- 

 nose, starch, sucrose and xylose. No 

 acid or gas from arabinose, glycerol, 

 mannitol, melezitose, rhamnose, salicin, 

 sorbitol or trehalose. 



Non-pathogenic for white mice and 

 rabbits. 



Anaerobic. 



Source : Five strains isolated from 

 human feces. 



Habitat: Probably intestinal canal of 

 mammals. 



