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MANUAL OF DETERMINATIVE BACTERIOLOGY 



rend. Soc. Biol., Paris, 126, 1937, 382; 

 Ehrlichia canis Moshkovsky, Uspekhi 

 Souremennoi Biologii (Russian) (Ad- 

 vances in Modern Biology), 19, 1945, 18.) 

 Moshkovsky selects this species as the 

 type species of the subgenus Ehrlichia 

 Moshkovsky (loc. cit.). Found in dogs 

 used for experimental purposes in Al- 

 geria. Appears to be transmitted natu- 

 rally by the dog tick (Rhipicephalus 

 sanguineus). All active stages of the 

 tick transmit the organism and it passes 

 iutraovarially from the female to the 

 larvae of the next generation. The or- 

 ganisms are generally spherical in shape 

 and can be seen in the circulating mono- 

 cytes. The infection causes a serious 

 and often fatal illness in dogs. Small 

 laboratorj' animals are not susceptible 

 to the disease. 



Rickettsia conjunctivae, Rickettsia con- 

 junctivae bovis and Rickettsia conjunc- 

 tivae gain, see Family III, Chlamydozo- 

 aceae. 



Rickettsia ctenocephali Sikora. (Arch. 

 Schiffs- u. Tropenhyg., 22, 1918, 442.) 

 Found in cat fleas (presumably Cteno- 

 cephalides felis) on the surface of the 

 organs in the body cavity and in the coe- 

 lomic fluid. Two forms were found which 

 might be two species, one resembling 

 Rickettsia pediculi and the other Rickett- 

 sia nielophagi. Hertig and Wolbach 

 (Jour. Med. Res., 44, 1924, 329) found 

 Rickettsia ctenocephali to vary in size 

 and shape from minute cocci to rather 

 large, swollen, curved rods, staining 

 reddish with the Giemsa stain. 



Rickettsia culicis Brumpt. (Ann. Para- 

 sitol. Hum. et Comp., 16, 1938, 153.) 

 Found in the stomach epithelium of 

 mosquitoes {C ulex fatigans) 12 days after 

 they had been fed on a patient carrying 

 Microfilaria bancrofti. Thought to be 

 pathogenic for the mosquito and possibly 

 for man. Occurs in the form of small 

 granules and more often as small bipolar 

 rods. Stains with haemalum, erythro- 

 sine-orange and toluidine blue. Gram- 

 negative. 



Rickettsia dermacentrophila Steinhaus. 

 (Pub. Health Repts., 57, 1942, 1375.) 

 Found in all stages of the wood tick {Der- 

 macentor andersoni). In the epithelial 

 cells of the intestinal diverticula and 

 other tissues of the tick, usually extra- 

 cellularly but sometimes intracellularly. 

 Xot seen in the nuclei of cells. Gram- 

 negative and staining red with the Mach- 

 iavello stain, and bluish-purple with 

 the Giemsa stain. Stains less deeply 

 with ordinary bacterial stains than most 

 bacteria. Resembles Rickettsia rickett- 

 sii morphologically but is slightly larger. 

 Not pathogenic for laboratory animals or 

 for some of the natural hosts of Derma- 

 centor andersoni. 



Rickettsia hirundinis Cowdry. (Jour. 

 Exp. Med., 37, 1923, 431.) An organism 

 observed by Arkwright, Atkin and Bacot 

 (Parasitology, 13, 1921, 27) in the tissues 

 of Cimex hirundinis which is probably 

 the same organism to which Cowdry re- 

 ferred as Rickettsia hirundinis. Con- 

 sidered by Steinhaus as a nomen nudum. 



Rickettsia kairo da Rocha-Lima. 

 (Cairo rickettsia, Arkwright and Bacot, 

 Brit. Jour. Exper. Path., 4, 1923, 70; da 

 Rocha-Lima, in Kolle and Wasserman, 

 Handb. d. path. Mikroorg., 3 Aufl., 8, 

 1930, 1361 . ) Resembles Rickettsia rocha- 

 limae and Rickettsia prowazekii. 



Rickettsia lectularia Arkwright, Atkin 

 and Bacot. (Parasitology, 13, 1921, 27.) 

 Found in the gut of the bedbug {Cimex 

 lectularius) as filamentous and rod- 

 shaped organisms. It seems probable 

 that all bedbugs harbor the organism 

 and it is also present in the developing 

 ova. The location is intracellular. Very 

 pleomorphic, ranging from small coccoid 

 forms to thread-like forms. The small 

 coccoid and diplococcoid forms stain 

 deep purple with the Giemsa stain, while 

 bacillary, lanceolate and thread forms 

 stain more red than purple with the 

 Giemsa stain. Not infective for small 

 laboratory animals or for man. 



Rickettsia linognathi Hindle. (Para- 

 sitology, 13, 1921, 152.) Found in the 



