Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . color themselves strongly at thepoles, giving rise to the dumb-bell shape (Fig. 97). Theydo not take the Gram stain; they are without spores, and donot liquefy gelatin. They have been divided into three groups. Bacillus avi-septicus, as it appears in fowls; Bacillus hovisepticus, as itattacks cattle; Bacillus suisepticus, as it attacks prominent members of each group are: Bacillus of HEMOREHAGIC SEPTICEMIA GROUP I93 chicken cholera of Pasteur, bacillus of swin
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . color themselves strongly at thepoles, giving rise to the dumb-bell shape (Fig. 97). Theydo not take the Gram stain; they are without spores, and donot liquefy gelatin. They have been divided into three groups. Bacillus avi-septicus, as it appears in fowls; Bacillus hovisepticus, as itattacks cattle; Bacillus suisepticus, as it attacks prominent members of each group are: Bacillus of HEMOREHAGIC SEPTICEMIA GROUP I93 chicken cholera of Pasteur, bacillus of swine plague, andbacillus of cattle-plague or pleuropneumonia. Bacillus of Chicken Cholera (Perroncito, Pasteur,1878).—Synonyms.—Micrococcus cholera gallinarum; Microbeen huit; avicidus bacillus; bacillus of fowl septicemia. Origin.—In 1879 Perroncito observed this coccus-like ba-cillus in diseases of chickens, and Pasteur, in 1880, isolatedand reproduced the disease with the bacillus in question. Form.—At first it was thought to be a micrococcus, but ithas been found to be a short rod, about twice as long as it is. Fig. 97.—Bacillus of swine-plague (from photograph by E. A. deSchweinitz). broad, the ends slightly rounded. The center is very slightlyinfluenced by the anilin colors, the poles easily, so that instained specimens the bacUlus looks like a dumb-bell or afigure-of-8 (Microbe en huit). Properties.—Does not possess self-movement; does notliquefy gelatin; no spores. Growth.—Occurs at ordinary temperature, requiring oxygenfor development. It grows very 194 ESSENTIALS OF BACTERIOLOGY Gelatin Plates.—In the course of three days little round,white colonies, which seldom increase in size, having a roughborder and very finely granulated. Stab-cultures.—^A very delicate gray line along the needle-track, which does not become much larger. Agar Stroke Culture.—^A moist, grayish-colored skin, moreappreciable at brood-heat. Potato.—^At 37° C, after se
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1913
