haus, 1946. (Spirochaetahermsi'Dsivis, Amer. Assoc. Adv. Sci., Pub. No. 18, 1942, 46; Steinhaus, Insect Microbiology, 1946, 453.) herm'si.i. M.L. gen. noun hermsii the spe- cific epithet of the tick vector of this spe- cies, Ornithodoros hermsi. Investigations by Davis (op. cit., 1942, 46) indicate that each species oi Ornithodoros that is a relapsing-fever vector carries a spirochete that is tick-host-specific and that this host-specific relationship offers a more accurate approach to the differentia- tion of relapsing-fever spirochetes than any of the several criteria previously used. This was shown to be the case for Borrelia hermsii and Borrelia parkeri. For this reason no attempt is made to describe the morphol- og}^ and other characters of the relapsing- fever spirochetes of North and South Amer- ica. Transmitted by Ornithodoros hermsi; not transmitted by other species of Ornithodoros from the Western Hemisphere. Pathogenicity: Produces characteristic relapses in adult white mice and guinea pigs. Habitat: Found as a cause of relapsing fever in British Columbia, Canada, Cali- fornia, Colorado, Idaho, Nevada, Oregon and Washington. 7. Borrelia duttonii (Novy and Knapp, 1906) Bergey et al., 1925. (See Button and Todd, Brit. Med. Jour., 2, 1905, 1259; Spiril- lum duttoni (sic) Novy and Knapp, Jour. Inf. Dis., 3, 1906 (March), 296; Spirochaeta duttoni Breinl, Lancet, 1, 1906 (June), 1691; Bergey et al.. Manual, 2nd ed., 1925, 434.) dut.to'ni.i. M.L. gen. noun duttonii of Dutton; named for J. E. Button, one of the bacteriologists who first described this spe- cies. Morphologically similar to Borrelia re- currentis. Growth occurs under anaerobic condi- tions in serum water, hydrocoele or ascitic fluid to which a piece of sterile rabbit kidney is added. This organism is antigenically distinct from the other causes of relapsing fever. Pathogenicit}': Varies widely with the strain. Not pathogenic for the guinea pig, but most strains are pathogenic for white mice and white rats, especially for the new- born of these two species. This species is transmitted to man through the bite of the tick (Ornithodoros moubata). There is hereditary transmission to at least the third generation of the tick. Not transmitted by the louse. Habitat: Found as the cause of Central and South African relapsing fever; also found in Madagascar. 8. Borrelia parkeri (Bavis, 1942) Stein- haus, 1946. (Spirochaeta parkeri Davis, Amer. Assoc. Adv. Sci., Pub. No. 18, 1942, 46; Steinhaus, Insect Microbiology, 1946, 453.) par'ker.i. M.L. gen. noun parkeri the spe- cific epithet of the tick vector of this species, Ornithodoros parkeri. Transmitted by Ornithodoros parkeri; not transmitted by other species of Ornithodoros from the Western Hemisphere. Pathogenicity : Produces characteristic relapses in adult white mice and guinea pigs. Source: From Ornithodoros parkeri from California, Idaho, Montana, Nevada, Ore- gon, Utah and Wyoming. Habitat: Found as a cause of relapsing fever in the Western part of the U. S. A. 9. Borrelia veneziielensis (Brumpt, 1921) Brumpt, 1922. (Spirochetes of relaps- ing fever in Panama, Bates, Bunn and St. John, Amer. Jour. Trop. Med., 1, 1921, 183; Treponema venezuelense Brumpt, in Lavier, Les Parasites des Invertebres Hematopha- ges. These, Paris, 1921, 207 pp.; also see Brumpt, Nouveau Traite de Medecine, Paris, 4, 1922, 492; Spirochete of Panama, St. John and Bates, Amer. Jour. Trop. Med., £, 1922, 262; Brumpt, op. cit., 1922, 495; Spirochaeta neotropicalis Bates and St. John, Jour. Amer. Med. Assoc, 79 1922, 575; Borrelia neotropicalis Steinhaus, Insect Microbiology, 1946, 453.) ve.ne.zue.len'sis. M.L. adj. venezuelensis the specific epithet of the tick vector of this species, Ornithodoros rudis (O. venezuelen- sis). Transmitted lv Ornithodoros rudis (0. venezuelensis) .
