. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Bacillus Pyocyaneus 331 In some cases pus has a peculiar bluish or greenish color, which depends upon the presence of Bacillus pyocyaneus of Gessard.* Distribution.—The bacillus appears to be a rather common saprophyte, being found in feces, manure, and water. It easily takes up its residence upon the skin and mucous membranes, and has been found in the perspiration. It sometimes occurs as a sapro- phyte upon the surgical dressings applied to wounds, and
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Bacillus Pyocyaneus 331 In some cases pus has a peculiar bluish or greenish color, which depends upon the presence of Bacillus pyocyaneus of Gessard.* Distribution.—The bacillus appears to be a rather common saprophyte, being found in feces, manure, and water. It easily takes up its residence upon the skin and mucous membranes, and has been found in the perspiration. It sometimes occurs as a sapro- phyte upon the surgical dressings applied to wounds, and some- times invades the tissues through wounds, to occasion dangerous infections. Morphology.—It is a short, slender organism with rounded ends, measuring X i to 2 /t, according to Flugge; X 2 to 6 /^, ac- cording to Ernst, and X 1 m, according to Charrin. It is quite pleomorphous, which probably accounts for the difference in measure- ments. It is occasionally united in chains of four or six. It is. Fig. -Bacillus pyocyaneus. Colonies upon gelatin (Abbott). actively motile, has one terminal fiagellum, and does not form spores. It closely resembles a harmless bacillus found in water, and known as Bacillus flourescens liquefaciens, from which Ruzickaf thinks it has probably descended. Staining.—It stains well with the ordinary staining solutions, but not by Gram's method. Isolation.—The isolation of the organism is simple, the ordinary plate method being a satisfactory means of securing it from pus or other discharges. Cultivation.—The organism grows readily upon all ordinary culture media, under aerobic and anaerobic conditions and at tem- peratures ranging from 18° to 45°C., the optimum temperature being 37°C. Colonies.—The superficial colonies upon gelatin plates are small, irregular, slightly greenish, ill-defined, and produce a distinct fluorescence of the neighboring medium. *"De la Pyocyanine et de son Microbe," TMse de Paris, 1882. f
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