Note: Rickettsia slovaca sp. nov., a member of the spotted fever group rickettsiae

Sekeyová, Zuzana; Roux, V; Xu, Wenbin; Rehácek, J; Raoult, Didier

doi:10.1099/00207713-48-4-1455

Cited by 60 publications

(31 citation statements)

References 30 publications

(13 reference statements)

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“…data) (10). R. slovaca, a member of the SFG rickettsiae, was isolated from D. marginatus ticks in Slovakia in 1968 (13). Research has established that this bacterium is widely distributed and has been isolated from D. marginatus, I. ricinus, Haemaphisalis spp., and Argas ticks in many countries (13).…”

Section: Discussionmentioning

confidence: 99%

“…R. slovaca, a member of the SFG rickettsiae, was isolated from D. marginatus ticks in Slovakia in 1968 (13). Research has established that this bacterium is widely distributed and has been isolated from D. marginatus, I. ricinus, Haemaphisalis spp., and Argas ticks in many countries (13). From a medical standpoint, R. slovaca infection seems to be the most important SFG rickettsiosis in central Europe because of the severe and characteristic symptoms that occur after being bitten by these ectoparasites.…”

Section: Discussionmentioning

confidence: 99%

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Rickettsiaspp. in Ticks, Poland

Chmielewski¹,

Podsiadły²,

Karbowiak³

et al. 2009

Emerg. Infect. Dis.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Rickettsiaspp. in Ticks, Poland

Chmielewski¹,

Podsiadły²,

Karbowiak³

et al. 2009

Emerg. Infect. Dis.

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“…The same year, Stothard and Fuerst (52) suggested that Rickettsia bellii (36) and Rickettsia canadensis (27) represented a phylogenetic line that predated the typhus-spotted fever group split and, thus, were included into a fourth group named the "ancestral" group. At present, the genus Rickettsia contains 21 validated species classified into three groups: (i) the ancestral group described above; (ii) the typhus group, which includes Rickettsia prowazekii (12) and Rickettsia typhi (34); and (iii) the spotted fever group, which consists of Rickettsia rickettsii (9), Rickettsia conorii (10), Rickettsia africae (20), Rickettsia sibirica (67), Rickettsia slovaca (48), Rickettsia honei (51), Rickettsia japonica (56), Rickettsia australis (35), Rickettsia akari (19), Rickettsia felis (6), Rickettsia aeschlimannii (1), Rickettsia helvetica (2), Rickettsia massiliae (3), Rickettsia rhipicephali (11), Rickettsia montanensis (63), Rickettsia parkeri (22), and Rickettsia peacockii (31). In addition to the 21 recognized species, more than 20 rickettsial isolates which have not been fully characterized or which have not received a species designation have been described, and the classification of these isolates is confusing (42).…”

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confidence: 99%

Gene Sequence-Based Criteria for Identification of NewRickettsiaIsolates and Description ofRickettsia heilongjiangensissp. nov

et al. 2003

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We propose genetic guidelines for the classification of rickettsial isolates at the genus, group, and species levels by using sequences of the 16S rRNA (rrs) gene and four protein-coding genes, the gltA, ompA, and ompB genes and gene D. To be classified as a member of the genus Rickettsia, an isolate should exhibit degrees of rrs and gltA homology with any of the 20 Rickettsia species studied of >98.1 and >86.5%, respectively. A member of the typhus group should fulfill at least two of the following four criteria: pairwise nucleotide sequence homologies with rrs, gltA, ompB, and gene D of either Rickettsia typhi or Rickettsia prowazekii of >99.4, >96.6, >92.4, and >91.6%, respectively. A member of the spotted fever group should either possess the ompA gene or fulfill at least two of the following four criteria: pairwise nucleotide sequence homologies with rrs, gltA, ompB, and gene D of any member of this group of >98.8, >92.7, >85.8, and >82.2%, respectively. The existence of a distinct "ancestral" group should be questioned. To be classified as a new Rickettsia species, an isolate should not exhibit more than one of the following degrees of nucleotide similarity with the most homologous validated species: >99.8 and > 99.9% for the rrs and gltA genes, respectively, and, when amplifiable, >98.8, >99.2, and >99.3% for the ompA and ompB genes and gene D, respectively. By use of our classification scheme, "Rickettsia heilongjiangii" belongs to a new species for which we officially propose the name Rickettsia heilongjiangensis sp. nov.The order Rickettsiales initially consisted of most of the bacteria associated with eukaryotic cells (63). On the basis of their 16S rRNA gene (rrs) sequences, Rickettsiella grylli, Coxiella burnetii, Wolbachia persica, Rochalimaea spp., Grahamella spp., Bartonella spp., Eperithrozoon ovis, and Hemobartonella spp. have been removed from the order Rickettsiales (5,7,41,43,62), which comprises only the genera Rickettsia, Orientia, Ehrlichia, Anaplasma, Neorickettsia, and Wolbachia. Historically, the genus Rickettsia was divided into three groups on the basis of phenotypic criteria: the typhus group, the spotted fever group, and the scrub typhus group (63). In 1995, Tamura et al. (53) proposed reclassification of Rickettsia tsutsugamushi (33) into a new genus, Orientia, using 16S rRNA gene sequence analysis. The same year, Stothard and Fuerst (52) suggested that Rickettsia bellii (36) and Rickettsia canadensis (27) represented a phylogenetic line that predated the typhus-spotted fever group split and, thus, were included into a fourth group named the "ancestral" group. At present, the genus Rickettsia contains 21 validated species classified into three groups: (i) the ancestral group described above; (ii) the typhus group, which includes Rickettsia prowazekii (12) and Rickettsia typhi (34); and (iii) the spotted fever group, which consists of Rickettsia rickettsii (9), Rickettsia conorii (10), Rickettsia africae (20), Rickettsia sibirica (67), Rickettsia slovaca (48), Rickettsia honei (5...

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“…there appear to be no boundaries to stop this agent (Tian et al, 2012). In 1998, on the basis of the distinctive clinical, epidemiological, phenotypic features and genotypic features, R. slovaca was finally accepted as a separate taxonomic species (Sekeyova et al, 1998). The prevalence of R. slovaca in Slovakia has been continuously monitored, confirmed in D. marginatus, and in other ticks (Rehacek et al, 1976a; Spitalska et al, 2012).…”

Section: Sfg Rickettsiae Detected And/or Isolated In Slovakiamentioning

confidence: 96%

Update on Rickettsioses in Slovakia

Sekeyová¹,

Socolovschi²,

Špitalská³

et al. 2013

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Summary. -The reported incidence of vector-borne diseases including various cases of Rickettsioses in humans is increasing due to a combination of climatic and social factors, escalating the opportunities for contact between people and ticks, fleas or lice. Many of the emerging infectious diseases currently challenging human health in Europe are transmitted by ticks which normally feed on domestic or wild animals. Each Rickettsia spp. has one or several tick vectors, and their geographical distribution varies according to geographical conditions; e.g.; altitude or temperature, which is gradually changing due to a global warming. Evidence of Rickettsia spp. particularly of a newly discovered species is a strong indication that a great number of diseases may be caused by so far undetected or unrecognized organisms. Their diagnosis relies mostly on rare "spot like" cooperation of clinicians with scientists, the members of the working groups that are devoted to the scientific studies of the corresponding research areas. The clinical picture of the disease caused by rickettsiae varies significantly from flu like symptoms to severe fatal outcomes, reflecting the various factors, e.g. a variability of virulence of rickettsial species due to cell invasion, dissemination of rickettsiae, genomics, immune response of an infected organism, or a tricky impact of a treatment. Several major reviews on rickettsioses have been previously published, e.g. in 1997(Parola et al., 2005, and in 2011 (Botelho-Nevers and Raoult, 2011). In this work we intend to present a short historical overview and to describe new trends in research studies of rickettsiology. The main focus will be on rickettsioses affecting Europe΄s population.

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Note: Rickettsia slovaca sp. nov., a member of the spotted fever group rickettsiae

Cited by 60 publications

References 30 publications

Rickettsiaspp. in Ticks, Poland

Rickettsiaspp. in Ticks, Poland

Gene Sequence-Based Criteria for Identification of NewRickettsiaIsolates and Description ofRickettsia heilongjiangensissp. nov

Update on Rickettsioses in Slovakia

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