Pathogenicity: White mice and white rats are susceptible, but the guinea pig, rabbit, dog and fowl are reported as refrac- tory. Comment: Brumpt (Precis de Parasitol., 3rd ed., Paris, 1936) regarded Borrelia neo- tropicalis Steinhaus as identical with Bor- relia venezuelensis Brumpt; this has been confirmed by Davis (Internat. Bull, of Bact. Nomen. and Taxon., 5, 1955, 107). Habitat: Found as a cause of relapsing fever in Panama, Colombia, Venezuela and Ecuador. 10. Borrelia persica (Dschunkowskj-, 1913) Steinhaus, 1946. (Spirochneta persica Dschunkowsk}', Deutsch. med. Wochnschr., 39, 1913, 419; Steinhaus, Insect Microbiol- ogy, 1946, 453.) per'si.ca. L. adj. persicus Persian. Transmitted by Ornithodoros tholozani. Pathogenicity: Varies considerably with the strain, but especiallj^ pathogenic for the guinea pig. Habitat: Found as a cause of relapsing fever in Iran (Persia). The vector of this species has a wide distribution: it is known from the Egyptian Western Desert, Cyprus, Israel, Iraq and the U.S.S.R. to the western border of China, Afghanistan and Kashmir. 11. Borrelia turicatae (Brumpt, 1933) Steinhaus, 1946. (Spirochaeta turicatae Brumpt, Compt. rend. Soc. Biol., Paris, US, 1933, 1369; Steinhaus, Insect Micro- biology, 1946, 453.) tu.ri.ca'tae. M.L. gen. noun turicatae of turicata, a Mexican tick. Transmitted by Ornithodoros turicata; 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 Me.xico, New Mexico, Kansas, Ok- lahoma and Texas. 12. Borrelia caucasica (Maruashvili, 1945) Davis, comb. nov. (Spirochaeta cau- casica Maruashvili, Med. Parasit., Parasitic Dis., H, 1945, 24.) cau.ca'si.ca. M.L. adj. caucasicus per- taining to the Caucasus. Transmitted by Ornithodoros verrucosus. Pathogenicity: Pathogenic for the guinea pig- Source: From Pallasinus erythourus cau- casiciis, Apodemus syhaticus and Mus mus- culus. Habitat: Found as a cause of relapsing fever in the Caucasus. 13. Borrelia novyi (Schellack, 1907) Bergey et al., 1925. (Spirochaete from re- lapsing fever, Norris, Pappenheimer and Flournoy, Jour. Inf. Dis., 3, 1906, 2^; Spiro- chaeta novyi Schellack, Arb. kaiserl, Gesund- heitsamte, 27, 1907, 199 and 364; Bergey et al.. Manual, 2nd ed., 1925, 434.) no'vy.i. M.L. gen. noun novyi of Novy; named for F. G. Novy, an American bac- teriologist. Morphologically similar to Borrelia re- cur rentis. Growth occurs under the same conditions as for Borrelia recurrentis. Antigenically distinct from other relap- sing-fever organisms. Pathogenic for monkeys, white rats and white mice. Arthropod vectors are unknown. Source: From a patient in Bellevue Hos- pital, New York. Origin of infection un- known. 14. Borrelia kochii (Novy, 1907) Bergey et al., 1925. (Spirochaeta kochi (sic) Novy, Proc. Path. Soc. Philadelphia, 10 (N.S.), 1907, 1; Bergey et al., Manual, 2nd ed., 1925, 434.) ko'chi.i. M.L. gen. noun kochii of Koch; named for Dr. Robert Koch, who was the first to observe spirochetes in East African relapsing fever. Morphologically similar to Borrelia re- currentis. Growth occurs under the same conditions as for Borrelia recurrentis. Antigenically distinct from both Borrelia recurrentis and B. duttonii. Pathogenic for mice and rats. No record of an arthropod vector. Comment: Regarded by some investi-
