. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. SPIROCHiET^ 369 the same laboratory. There are certain differences between these spirochetes of human relapsing fever, and several distinct varieties (6r species?) are recognized. We shall consider them as varieties of Sp. recurrentis. Spirochaeta Recurrentis var. Duttoni.—This is the spirochete of Congo tick fever discovered by Button and Todd in 1904. It is about in thickness and 24 to 30^ in length. The organism has
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. SPIROCHiET^ 369 the same laboratory. There are certain differences between these spirochetes of human relapsing fever, and several distinct varieties (6r species?) are recognized. We shall consider them as varieties of Sp. recurrentis. Spirochaeta Recurrentis var. Duttoni.—This is the spirochete of Congo tick fever discovered by Button and Todd in 1904. It is about in thickness and 24 to 30^ in length. The organism has been cultivated by Noguchi^ in ascitic fluid containing sterile tissue and covered by paraffin oil. The African tick fever caused. Fig. 143.—Spirochaetae of relapsing fever in blood of a man. {After KoUe and Wassermann.) by this organism is one of the most fatal of the relapsing The tick remains infective for a very long time and also transmits the infection to its offspring through the egg. Other insects,^ fleas'and lice, are also capable of transmitting the infection. Spirochaeta Recurrentis var. Rossii (Kochi).—This organism occurs ill the blood of relapsing fever of East Africa. It resembles Sp. duttoni very closely. Noguchi obtained cultures readily in ascitic fluid containing sterile tissue. Spirochaeta Recurrentis var. Novj^.'—This organism is more slender than the two preceding varieties, measuring about ' Journ. Exp. Med., 1912, Vol. XVI, pp. 199-210. 2 Nuttall, Johns Hopkins Hasp. Bull., 1913, Vol. XXIV, pp. 33-39. ' Novy and Knapp: Journ. Inf. Diseases, igo6, Vol. Ill, pp. 291^-393. 24. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacNeal, Ward J. , 1881-1946; Williams, Herbert Upham, 1866-. Philadelphia, P. Blakiston's Son & Co.
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