FAMILY XII. CORYXEBACTERIACEAE 



585 



pseudotuberculosis Buchanan, Veter. Bact., 

 Phila., 1911, 238; Eberson, Jour. Inf. Dis., 

 £S, 1918, 10.) 



pseu.do.tu.ber.cu.lo'sis. Gr. adj. pseudes 

 false; L. neut.n. tuberculum a little tubercle; 

 M.L. fem.n. tuberculosis tuberculosis; M.L. 

 gen. noun pseudotuberculosis of false tuber- 

 culosis. 



Common name: Preisz-Nocard bacillus. 



Slender rods, 0.5 to 0.6 by 1.0 to 3.0 mi- 

 crons, staining irregularly and showing 

 clubbed forms. Non-motile. Gram-positive. 



Gelatin colonies: Slight development. 



Gelatin stab: No liquefaction. 



Agar colonies: Thin, cream-colored to 

 orange, folded, serrate, dry. 



Loeffler's blood serum: Small, yellow, ser- 

 rate colonies. No liquefaction. 



Broth: No turbidity. Granular sediment. 

 Pellicle formed (Carne, Jour. Path, and 

 Bact., J^9, 1939, 316). 



Litmus milk: Unchanged. 



Potato: No growth. 



Acid from glucose, fructose, galactose, 

 mannose, sucrose, lactose, maltose and 

 dextrin. Some strains attack xylose. 



Nitrites not produced from nitrates. 



Aerobic, facultative. 



Optimum temperature, 37° C. 



Causes caseous lymphadenitis in sheep 

 and ulcerative lymphangitis in horses. 

 Forms an exotoxin. 



Shows a close serological relationship 

 with Corynebacterium renale (Merchant, 

 Jour. Bact., 30, 1935, 109). 



Source: Isolated from necrotic areas in 

 the kidney of a sheep. 



Habitat: Found in caseous lymphadenitis 

 in sheep and ulcerative lesions in horses, 

 cattle and other warm-blooded animals. 



6. Corynebacterium xerosis Lehmann 

 and Neumann, 1899. (Bacillus der xerose, 

 Neisser and Kuschbert, Breslauer artzl. 

 Ztschr., 5, 1883, 42; Lehmann and Neumann, 

 Bakt. Diag., 2 Aufl., 2, 1899, 365 and 385.) 



xe.ro'sis. Gr. fem.n. xerosis a parched 

 skin, xerosis; M.L. gen.noun xerosis of 

 xerosis. 



An excellent historical discussion of this 

 organism is given by Andrewes et al. (Diph- 

 theria. London, 1923, 377-382). 



Rods showing polar staining; occasionally 



club-shaped forms are seen. Non-motile. 

 Gram-positive. 



Plain gelatin colonies: Rarely develop. 



Serum gelatin stab: No liquefaction. 



Agar colonies: Minute, circular, almost 

 transparent, raised, smooth, pearly white. 



Agar slant: Thin, grayish, limited growth. 



Loeffler's blood serum: Thin, grayish, 

 adherent growth. 



Broth: Clear, with slight, granular sedi- 

 ment. 



Litmus milk: Unchanged. 



Potato: No visible growth. 



Indole not produced. 



Acid from glucose, fructose, galactose, 

 maltose and sucrose. 



Nitrites not produced from nitrates. 



Aerobic, facultative. 



Optimum temperature, 37° C. Grows very 

 slowly as low as 18° to 25° C. (Eberson, 

 Jour. Inf. Dis., 23, 1918, 3). 



Not pathogenic. 



Source : Isolated from normal and diseased 

 conjunctiva. Kuschbert (Deutsche med. 

 Wochnschr., 10, 1884, 321 and 341) states 

 that this species was originally isolated by 

 Colomiatti. 



Habitat: Probably identical with other 

 species described from the skin and other 

 parts of the body. 



7. Corynebacterium pyogenes (Glage, 

 1903) Eberson, 1918. (Bacillus liguefaciens 

 pyogenes bovis Lucet, Ann. Inst. Past., 7, 

 1893, 327; Bacillus pyogenes Glage, Ztschr. f. 

 Fleisch- u. Milchhyg., 13, 1903, 166; Eberson, 

 Jour. Inf. Dis., 23, 1918, 5.) 



py.o'ge.nes. Gr. noun pyuni pus; Gr. v. 

 gennaio to produce; M.L. adj. pyogenes pus- 

 producing. 



For a fuller description see Brown and 

 Orcutt (Jour. Exp. Med., 32, 1920, 244). 



Rods 0.2 by 0.3 to 2.0 microns in length. 

 Smallest forms appear as scarcely visible 

 points (common in old abscesses). Chains 

 formed. Club forms may be present. Non- 

 motile. Gram-positive. 



Serum gelatin: Liquefaction. 



No growth on ordinary agar. 



Serum agar: Minute colonies after 36 to 

 48 hours. Surface colonies may increase to 

 3 mm in diameter. Colonies smoky brown by 



