242 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



Habitat : Skin and mucous membranes. 

 The cause of boils, abscesses, furuncles 

 suppuration in wounds, etc. 



9b. Micrococcus pyogenes var. albus 

 (Rosenbach) Schroeter. {Staphylococcus 

 pyogenes albus Rosenbach, Mikroorganis- 

 men bei den Wundinfektionskrankheiten 

 des Menschcn, Wiesbaden, 1884, 2 ; Staph- 

 ylococcus albus Rosenbach, ibid., 27; 

 Micrococcus pyogenes var. albus Schroe- 

 ter, in Cohn, Kryptog. Flora v. Schlesien, 

 3, 1, 1886, 147; Micrococcus pyogenes 

 Migula, Syst. d. Bakt., 2, 1900, 87; Alba- 

 coccus pyogenes Winslow and Rogers, 

 Jour. Inf. Dis., 3, 1906, 544; Micrococcus 

 oZ6ws Buchanan, Veterinary Bacteriology 

 1911, 196; (Tetracoccus) Microccocus 

 pyogenes albus Orla-Jensen, The Lactic 

 Acid Bacteria, 1919, 81; Staphylococcus 

 pyogenes-albus Holland, Jour. Bact., 5, 

 1920, 225.) From Latin, albus, white. 



Spheres: 0.6 to 0.8 micron, occurring 

 singly, in pairs and in irregular groups. 

 Non-motile. Gram-positive. 



Gelatin stab : Saccate liquefaction with 

 heavy white sediment. 



Agar colonies : Circular, white, smooth, 

 glistening, entire. 



Ten per cent evaporated milk agar: 

 Growth at 20°C frequently orange 

 (Chapman, Jour. Bact., 45, 1943, 405). 



Agar slant: Abundant, white, smooth, 

 glistening. 



Broth: Turbid, with delicate pellicle 

 and white sediment. 



Litmus milk : Acid ; coagulated. Little 

 or no visible peptonization. 



Potato: Thick, smooth, white, glisten- 

 ing. 



Indole not formed. 



Nitrites produced from nitrates. 



Hydrogen sulfide is formed. 



Acid formed from glucose, lactose, 

 sucrose, glycerol and mannitol, but not 

 from raffinose, salicin and inulin. 



Forms inactive or levorotary lactic 

 acid (Orla-Jensen, loc. cit.). 



Starch not hydrolyzed. 



Ammonia produced from peptone. 



Does not utilize NH4H2PO4 as a source 

 of nitrogen. 



Pathogenic. Production of toxins, 

 coagulase and hemolysin as in Micro- 

 coccus aureus. 



Aerobic, facultative. 



Optimum temperature 37°C. 



Source : Originally isolated from pus. 



Habitat : Skin and mucous membranes. 

 Occurs in wounds, boils, abscesses, etc. 



10. Micrococcus citreus Migula. 

 (Staphylococcus pyogenes citreus Passet, 

 Aetiologie der eiterigen phlegmone des 

 ]\Ienschen, Berlin, 1885, 9; Micrococcus 

 pyogenes citreus Schroeter, in Cohn, 

 Kryptog. Flora v. Schlesien, 3, 1, 1886, 

 147; Migula, Syst. d. Bakt., 2, 1900, 147; 

 Staphylococcus citreus Bergey et al., 

 Manual, 1st ed., 1923,55.) From Latin, 

 citreus, of or relating to the citrus tree; 

 M. L., lemon yellow. 



Spheres: 0.9 micron, occurring singly. 

 Gram-positive. 



Gelatin colonies : Circular, pale yellow, 

 granular, entire, liquefying in 6 days. 



Gelatin stab : Lemon yellow surface 

 growth sinking into the medium. Gray- 

 ish-white growth in stab. Complete 

 liquefaction in 43 days. 



Agar colonies: Small, yellow, smooth, 

 entire. 



Agar slant: Broad, lemon yellow, glis- 

 tening, elastic. 



Broth: Turbid, with yellow sediment 

 and pellicle. 



Litmus milk: Acid, with slow coagula- 

 tion. 



Potato : Thin, grayish streak, becoming 

 citron yellow. 



Indole not formed. 



Nitrites produced from nitrates. 



Starch not hydrolyzed. 



Acid from glucose, lactose, sucrose, 

 raffinose, inulin, salicin, glycerol and 

 mannitol. 



Does not utilize NH4H2PO4 as a source 

 of nitrogen. 



Ammonia produced from peptone. 



Aerobic, facultative. 



Pathogenic. 



Optimum temperature 37 °C. 



Source : Originally isolated from pus. 



