Pathogenicity: Pathogenic for white mice but not for guinea pigs. Source: Isohited from Or nithodoros dugesi in Mexico. 21. Borrelia graingeri (Heisch, 1953) Davis, comb. nov. (Spirochaeta graingeri Heisch, Parasitology, 43, 1953, 133.) grain'ger.i. M.L. gen. noun graingeri the specific epithet of the tick vector of this spe- cies, Ornithodoros graingeri. Transmitted by Ornithodoros graingeri. Pathogenicity: White rats and mice are mildly susceptible. Guinea pigs, a monkey {Cercopithecus aelhiops) and a young rabbit were not susceptible. Causes a persistent parasitemia in cases of general paralysis of man. Source: Isolated from Ornithodoros grain- geri from caves near Tiwi, about 20 miles south of Mombasa, Kenya. 22. Borrelia babylonensis (Brumpt, 1939) Davis, comb. nov. {Spirochaeta babylo- nensis Brumpt, Compt. rend. Acad. Sci., Paris, 208, 1939, 2030.) ba.by.lo.nen'sis. L. adj. babylonensis pertaining to Babylon. Transmitted by Ornithodoros tholozani var. babylonensis. Pathogenic for guinea pigs. Comments: Originally reported as iso- lated from Ornithodoros asperus. Later it was found that the ticks were not O. asperus but 0. tholozani. However, as this spirochete was transmitted only by 0. tholozani col- lected near Babylon and not by 0. tholozani from other areas, the spirochete was ac- corded specific rank and the tick was given a varietal status, 0. tholozani var. babylonen- sis. (See Brumpt, Precis de Parasitol., 1, 1949, 101.) Source: Isolated from Ornithodoros tholo- zani var. babylonensis from a rodent burrow- in the ruins of Kish near Babylon. 23. Borrelia crocidurae (Leger, 1917) Davis, comb. nov. {Spirochaeta crocidurae Leger, Bull. Soc. Path. Exot., 10, 1917, 280.) cro.ci.du'rae. M.L. gen. noun crocidurae of Crocidura; M.L. fem.n. Crocidura a genus of rodents. Transmitted by Ornithodoros erraticus (small form). Pathogenicity: Pathogenic for white mice but not for guinea pigs. Source: Isolated from the shrew-mouse, Crocidura stampflii, in Senegal. 24. Borrelia dipodilli (Heisch, 1950) Davis, comb. nov. {Spirochaeta dipodilli Heisch, Ann. Trop. Med. and Parasit., 44, 1950, 260.) di.po.dil'li. M.L. gen. noun dipodilli of Dipodillus; M.L. mas.n. Dipodillus a genus of rodents. Transmitted by Ornithodoros erraticus (small form). There is no cross immunity against Bor- relia duttonii, B. harveyi, B. turicatae or B. crocidurae. Pathogenicity: Pathogenic for rats, mice, monkeys and young rabbits but not for guinea pigs; man is mildly susceptible. Source: Isolated from the pigmy gerbille {Dipodillus sp.) from Crescent Island on the east shore of Lake Naivasha, Kenya. 25. Borrelia latyschewii (Soviev, 1941) Davis, 1948. {Spirochaeta laiyschewi (sic) Soviev, Parasitic Diseases (U.S.S.R.), 10, 1941, 267; Davis, Ann. Rev. Microbiology, 2, 1948, 315.) la.ty.sche'wi.i. M.L. gen. noun laty- schewii of Latyschew; named for Latyschew. Transmitted by Ornithodoros tartakovskyi. Pathogenicity: Pathogenic for white mice and rabbits but not for white rats, guinea pigs or dogs. Source: Isolated from the gerbilles Rhom- bornbys opimus and Gerbillus eversmanni in Fergana, Usbekistan; also found in Iran. 26. Borrelia hyos (King and Drake, 1915) Bergey et al., 1925. (Hog cholera virus, King and Baeslack, Jour. Inf. Dis., 12, 1913, 39; Spirochaeta suis King, Baeslack and Hoff- mann, Jour. Inf. Dis., 12, 1913, 235; not Spirochaeta suis Bosanquet, Spirochetes, Saunders, 1911; Spirochaeta hyos King and Drake, Jour. Inf. Dis., 16, 1915, 54; Bergey et al.. Manual, 2nd ed., 1925, 436.) hy'os. L. noun hys, hyos the hog. Cells 1 by 5 to 7 microns. Distinctly shorter and thicker than the other mem- bers of the genus. Motile with an active, spinning motion, the spirals being fixed.
