A practical treatise on medical diagnosis : for students and physicians . ct as an orange-colored mass. On potato it grows as a brilliantorange-colored, somewhat lobulated layer. The growth gives off anodor of sour paste. (See Plate II., Fig. 3.) 2. Staphylococcus Pyogenes Albus. It is also found in acuteabscesses, but less often than the aureus, and is less virulent. It is morphologically identical with the aureus, but develops nopigment. The surface cultures are milk-white, and the mass at thebottom of the liquefying gelatin is white. 3. Staphylococcus Epidermidis Albus closely simulates the
A practical treatise on medical diagnosis : for students and physicians . ct as an orange-colored mass. On potato it grows as a brilliantorange-colored, somewhat lobulated layer. The growth gives off anodor of sour paste. (See Plate II., Fig. 3.) 2. Staphylococcus Pyogenes Albus. It is also found in acuteabscesses, but less often than the aureus, and is less virulent. It is morphologically identical with the aureus, but develops nopigment. The surface cultures are milk-white, and the mass at thebottom of the liquefying gelatin is white. 3. Staphylococcus Epidermidis Albus closely simulates thestaphylococcus pyogenes albus. It is the most common micro-organismon the surface of the body, and is often present in parts of the epidermistoo deep for disinfection save by heat. It is supposed to be the usualcause of stitch abscess. 4. Streptococcus Pyogenes. It is found in acute abscesses, ery-sipelas, otitis media, puerperal metritis, ulcerative endocarditis, pseudo-diphtheria, scarlatinal angina, and most purulent inflammations of aphlegmonous character. Fig. Streptococcus pyogenes in pus. X SOO. (Flugge.) Morphology. Cover-glass preparations show spherical cocci of vary-ing sizes, which form chains of four to twenty elements, the chainsoften forming tangled masses. It is stained by the basic anilines or byGrams method. (See Plate L, Fig. 2, b; and Fig. 16.) Biological properties. Grows in most media at temperature of 16° to37° C. (best 30° to 37°), but not on potato. It is a facultative anaero-bic, and does not liquefy gelatin. On plates it forms a flat transparentdisc of about one-half millimetre diameter. In stab cultures it grows allalong the puncture and forms a white opaque granular column. Thedeath-point is 52° to 54°, ten minutes exposure. (See Plate II., Fig. 1,and Fig. 2.) Inoculated, it causes erysipelatous or phlegmonous inflammation. 5. The Tubercle Bacillus. This is seen at times in pus removedfrom phthisical cavities, and the pus of abscesses, pa
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