FAMILY VI. BACTEROIDACEAE 



435 



bic bacillus, Tunnicliff, Jour. Inf. Dis., IS, 

 1913, 289; Bacterium destillationis Weinberg 

 et al., Les Microbes Ana^robies, 1937, 762; 

 Ristella destillationis Prevot, Ann. Inst. 

 Past.,eO, 1938,291.) 



des.til.la.ti.o'nis. L. prep, de from, down; 

 L. noun stillatio a dropping down; L. noun 

 destillatio a dripping down; L. gen. noun 

 destillationis of a distillation. 



Rods, 0.3 by 2.0 microns, occurring singly 

 or in clumps; filaments are formed. Non- 

 motile. Gram-negative. 

 Gas is not produced. 

 Serum or ascitic fluid favors growth. 

 Plain agar: No growth. 

 Goat blood agar colonies: Round, convex, 

 white becoming yellowish, very cohesive; 

 growth in water of condensation is grayish 

 white and mucoid. 



Blood agar and ascitic fluid agar stabs: 

 Colonies are lenticular, coherent, mucoid. 

 Loefller's serum: Smooth colonies. 

 Potato: Smooth, moist, adherent growth. 

 Nutrient broth: No growth. 

 Glucose bouillon: Growth occurs as ir- 

 regular, mucoid zoogloea; no turbidity. 

 Anaerobic. 



Optimum temperature, 37° C.; killed at 

 55° C. 



Pathogenicity: Toxic but not pathogenic 

 to guinea pigs when inoculated in large num- 

 bers. Following two inoculations (18 days 

 apart) with the water of condensation from 

 cultures in Loeffler's blood serum, a pul- 

 monary congestion and broncho-pneumonia 

 with atelectasis, culminating in death, were 

 produced in guinea pigs. 



Source: Isolated from a case of chronic 

 bronchitis. 



Habitat : Found in the human respiratory 

 tract; not common. 



27. Bacteroides viscosus Hauduroy et 

 al., 1937. (Coccobacterium mucosum anaerobi- 

 cum Klinger, Cent. f. Bakt., I Abt., Grig., 

 62, 1912, 186 (type species (monotypy) of 

 genus Coccobacterium Klinger, loc. cit.); 

 Bacterium mucosum, Weinberg et al., Les 

 Microbes Anaerobies, 1937, 727; not J5ac/eri- 

 um mucosum Mez, Mikroskopische Wasser- 

 analyse, Berlin, 1898, 57; Hauduroy et al., 

 Diet. d. Bact. Path., 1937, 81; Capsularis 



7nucosus Prevot, Ann. Inst. Past., 60, 1938 

 293.) 



vis.co'sus. L. adj. viscosus sticky, viscous. 



Short, ellipsoidal rods, 0.4 by 1.0 to 2.0 

 microns. Pleomorphic on culture media. 

 Encapsulated. Non-motile. Show bipolar 

 staining. Gram-negative. 



Serum gelatin: Liquefaction. 



Serum agar: Deep colonies small, lenticu- 

 lar; gas with fetid odor. 



Serum broth: Mucoid growth in bottom 

 of tube; gas and fetid odor. 



Indole produced in serum broth. 



Hydrogen sulfide produced in serum 

 broth. 



Anaerobic. 



Growth only at 37° C. 



Pathogenicity: Produces subcutaneous 

 abscesses in rabbits, guinea pigs and mice. 



Distinctive characters: Grows only if 

 serum is added to the medium. 



Source: One strain was isolated from a 

 brain abscess following bronchiectasis in 

 man. 



Habitat: Presumably found in various 

 infections in man. 



28. Bacteroides variabilis (Distaso, 

 1912) Castellani and Chalmers, 1919. 

 {Bacillus variabilis Distaso, Cent. f. Bakt., 

 I Abt., Orig., 62, 1912, 441; Castellani and 

 Chalmers, Man. Trop. Med., 3rd ed., 1919, 

 960; Capsularis variabilis Prevot, Ann. Inst. 

 Past., 60, 1938, 293.) 



va.ri.a'bi.lis. L. adj. variabilis variable. 



Short rods, with rounded ends, occurring 

 singly; some cells appear as long, flexuous 

 rods. Encapsulated. Non-motile. Gram- 

 negative. 



Gelatin: No growth on plain gelatin 

 (Distaso) ; liquefaction (Eggerth and Gag- 

 non, Jour. Bact., 25, 1933, 400). 



Blood agar colonies: Smooth, glistening, 

 elevated and very mucoid, about 1.0 mm in 

 diameter. 



Broth: Diffuse growth. 



Litmus milk: Unchanged (Distaso); acidi- 

 fied and some strains coagulating in 25 to 

 35 days (Eggerth and Gagnon). 



Indole is produced. 



Hydrogen sulfide is produced. 



Acid and gas from glucose, lactose and 

 sucrose (Distaso). Acid but no gas from 



