It has previously been observed that Rickettsia prowazekii has an unusual arrangement of the rRNA genes. In this species, the three rRNA genes, 16S (rrs), 23S (rrl), and 5S (rrf), are not linked in the typical arrangements for bacteria. Rather, the 16S rRNA gene has been separated from the 23S and 5S rRNA gene cluster, and the 23S rRNA gene is preceded by a gene which codes for methionyl-tRNAf(...

Objetivo. Informe sobre especies de garrapatas que parasitan a los humanos en un área del bioma semiárido Caatinga, noreste Brasil, con nota infección por rickettsias. Materiales y métodos. Todas las se identificaron morfológicamente estereomicroscopio. Algunas recolectadas analizaron molecularmente para detectar la presencia ADN bacterias género Rickettsia. Las sometieron individualmente extra...

Ticks (n = 663) and fleas (n = 470) collected from domestic animals from southeastern Tunisia were screened for Rickettsia infection using reverse line blot assay. Evidence of spotted fever group Rickettsia was obtained. We detected Rickettsia felis in fleas, Rickettsia massiliae Bar 29 and the Rickettsia conorii Israeli spotted fever strain in ticks, and Rickettsia conorii subsp. conorii and R...

Received 24 November 2003; accepted 25 November 2003; electronically published 1 March 2004. Reprints or correspondence: Dr. Didier Raoult, Unité des Rickettsies—CNRS UMR 6020, Faculté de Médecine, 27, boulevard Jean Moulin, Marseille 13385, France (Didier. [email protected]). Clinical Infectious Diseases 2004; 38:812–3 2004 by the Infectious Diseases Society of America. All rights re...

BACKGROUND Ticks are vectors and important reservoirs for microbial agents that cause disease in humans and animals. Among these pathogens, the members of Rickettsia species play an important role in public health. AIM AND METHODS One hundred twenty-nine ticks belonging to four tick species (Ixodes ricinus, Rhipicephalus turanicus, Dermacentor marginatus, and Haemaphysalis punctata) were coll...

Using PCR, we screened 411 ticks from four genera collected in Russia and Kazakhstan for the presence of rickettsiae and ehrlichiae. In Russia, we detected "Rickettsia heilongjiangensis," Rickettsia sp. strain RpA4, and Ehrlichia muris. In Kazakhstan, we detected Rickettsia sp. strain RpA4 and a rickettsia closely related to Rickettsia aeschlimannii. These agents should be considered in a diffe...

A novel rickettsia was detected in Ixodes tasmani ticks collected from Tasmanian devils. A total of 55% were positive for the citrate synthase gene by quantitative PCR. According to current criteria for rickettsia speciation, this new rickettsia qualifies as Candidatus Rickettsia tasmanensis, named after the location of its detection.

Herein we present the draft genome sequence and annotation of "Candidatus Rickettsia asemboensis" strain NMRCii. "Ca. Rickettsia asemboensis" is phylogenetically related to but distinct from the flea-borne spotted fever pathogen Rickettsia felis. "Ca. Rickettsia asemboensis" was initially identified in and subsequently isolated from Ctenocephalides cat and dog fleas from Kenya.

DNA from ticks recovered from 1137 dogs and 133 cats from all over Japan were examined for Rickettsia infection by citrate synthase gene (gltA)-based PCR and partial nucleotide sequencing. A total of 91 dog tick samples and 18 cat tick samples showed a single band of the appropriate size in the nested PCR. Sequence analysis was successfully performed on 102 samples. DNA of Rickettsia japonica o...

Migratory birds are known to play a role as long-distance vectors for many microorganisms. To investigate whether this is true of rickettsial agents as well, we characterized tick infestation and gathered ticks from 13,260 migratory passerine birds in Sweden. A total of 1127 Ixodes spp. ticks were removed from these birds and the extracted DNA from 957 of them was available for analyses. The DN...