Rickettsia tamurae sp. nov., isolated from Amblyomma testudinarium ticks

Fournier, Pierre‐Edouard; Takada, Nobuhiro; Fujita, Hiromi; Raoult, Didier

doi:10.1099/ijs.0.64134-0

Cited by 75 publications

(52 citation statements)

References 14 publications

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“…Interestingly, this new rickettsial strain has never been reported before, even though hundreds of A. cajennense or A. dubitatum ticks have been tested for rickettsial infection in other areas (GUEDES et al 2005;SANGIONI et al, 2005;HORTA et al, 2007;PACHECO et al, 2009). Currently, R. tamurae is known to occur in Japan, where it infects the tick Amblyomma testudinarium (FOURNIER et al, 2006). Its role as a human or animal pathogen remains unknown.…”

Section: Discussionmentioning

confidence: 99%

Rickettsia species infecting Amblyomma ticks from an area endemic for Brazilian spotted fever in Brazil

Guedes

Leite

Pacheco

et al. 2011

Rev. Bras. Parasitol. Vet.

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This study reports rickettsial infection in Amblyomma cajennense and Amblyomma dubitatum ticks collected in an area of the state of Minas Gerais, Brazil, where Brazilian spotted fever is considered endemic. For this purpose, 400 adults of A. cajenennse and 200 adults of A. dubitatum, plus 2,000 larvae and 2,000 nymphs of Amblyomma spp. were collected from horses and from the vegetation. The ticks were tested for rickettsial infection through polymerase chain reaction (PCR) protocols targeting portions of three rickettsial genes (gltA, ompA, and ompB). Only two free-living A. cajennense adult ticks, and four pools of free-living Amblyomma spp. nymphs were shown to contain rickettsial DNA. PCR products from the two A. cajennense adult ticks were shown to be identical to corresponding sequences of the Rickettsia rickettsii strain Sheila Smith. DNA sequences of gltA-PCR products of the four nymph pools of Amblyomma spp. revealed a new genotype, which was shown to be closest (99.4%) to the corresponding sequence of Rickettsia tamurae. Our findings of two R. rickettsii-infected A. cajennense ticks corroborate the endemic status of the study area, where human cases of BSF were reported recently. In addition, we report for the first time a new Rickettsia genotype in Brazil.

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Section: Discussionmentioning

confidence: 99%

Rickettsia species infecting Amblyomma ticks from an area endemic for Brazilian spotted fever in Brazil

Guedes

Leite

Pacheco

et al. 2011

Rev. Bras. Parasitol. Vet.

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“…Currently, 26 Rickettsia species with validated and published names have been reported (http://www.bacterio.cict.fr/qr /rickettsia.html), including Rickettsia asiatica (3), Rickettsia heilongjiangensis (4), Rickettsia hoogstraalii (5), Rickettsia raoultii (6), and Rickettsia tamurae (7), which were reported since 2005 (2). In addition to these 26 species, subspecies have been proposed within the Rickettsia conorii (8) and Rickettsia sibirica (9) species.…”

Section: Taxonomic and Genomic Bacteriology: The Revolutionmentioning

confidence: 99%

“…R. tamurae was isolated from Amblyomma testudinarium ticks in Japan (7). The typical hosts of this tick are wild and domestic pigs, but the tick also infests deer, cattle, other livestock, and humans.…”

Section: Tick-borne Rickettsiae In Asia Species Identified As Pathogensmentioning

confidence: 99%

Update on Tick-Borne Rickettsioses around the World: a Geographic Approach

et al. 2013

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SUMMARY Tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus Rickettsia . These zoonoses are among the oldest known vector-borne diseases. However, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. Several species of tick-borne rickettsiae that were considered nonpathogenic for decades are now associated with human infections, and novel Rickettsia species of undetermined pathogenicity continue to be detected in or isolated from ticks around the world. This remarkable expansion of information has been driven largely by the use of molecular techniques that have facilitated the identification of novel and previously recognized rickettsiae in ticks. New approaches, such as swabbing of eschars to obtain material to be tested by PCR, have emerged in recent years and have played a role in describing emerging tick-borne rickettsioses. Here, we present the current knowledge on tick-borne rickettsiae and rickettsioses using a geographic approach toward the epidemiology of these diseases.

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“…The shell vial procedure and intracellular culture have allowed us to culture 18 different species of Rickettsia and have facilitated participation in the description of 7 new bacterial species or subspecies (195,(378)(379)(380)(381)(382)(383) and in the first culture of 4 new rickettsial species (40,(384)(385)(386). Interestingly, Rickettsia felis is now associated with acute febrile illness (387,388) and with a vesicular fever called "yaaf" in Africa (389).…”

Section: Resultsmentioning

confidence: 99%

Current and Past Strategies for Bacterial Culture in Clinical Microbiology

et al. 2015

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SUMMARY A pure bacterial culture remains essential for the study of its virulence, its antibiotic susceptibility, and its genome sequence in order to facilitate the understanding and treatment of caused diseases. The first culture conditions empirically varied incubation time, nutrients, atmosphere, and temperature; culture was then gradually abandoned in favor of molecular methods. The rebirth of culture in clinical microbiology was prompted by microbiologists specializing in intracellular bacteria. The shell vial procedure allowed the culture of new species of Rickettsia . The design of axenic media for growing fastidious bacteria such as Tropheryma whipplei and Coxiella burnetii and the ability of amoebal coculture to discover new bacteria constituted major advances. Strong efforts associating optimized culture media, detection methods, and a microaerophilic atmosphere allowed a dramatic decrease of the time of Mycobacterium tuberculosis culture. The use of a new versatile medium allowed an extension of the repertoire of archaea. Finally, to optimize the culture of anaerobes in routine bacteriology laboratories, the addition of antioxidants in culture media under an aerobic atmosphere allowed the growth of strictly anaerobic species. Nevertheless, among usual bacterial pathogens, the development of axenic media for the culture of Treponema pallidum or Mycobacterium leprae remains an important challenge that the patience and innovations of cultivators will enable them to overcome.

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Rickettsia tamurae sp. nov., isolated from Amblyomma testudinarium ticks

Cited by 75 publications

References 14 publications

Rickettsia species infecting Amblyomma ticks from an area endemic for Brazilian spotted fever in Brazil

Rickettsia species infecting Amblyomma ticks from an area endemic for Brazilian spotted fever in Brazil

Update on Tick-Borne Rickettsioses around the World: a Geographic Approach

Current and Past Strategies for Bacterial Culture in Clinical Microbiology

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