| [action of the lysozyme isolated from ixodid tick species on rickettsia prowazekii, rickettsia canada and rickettsia sibirica]. | | 1979 | 117293 |
| susceptibility of some species of rodents to rickettsiae. | the present study was designed to test the susceptibility of free-living rodents, viz apodemus flavicollis, microtus arvalis, clethrionomys glareolus, mus musculus, and outbred white mice from dobrá voda farm, csfr, to coxiella burnetii, rickettsiae of the spotted fever group (rickettsia sibirica, r. conorii, r. slovaca and r. akari) and rickettsiae of typhus group (r. typhi and r. prowazekii) by various routes of administration. the highest levels of antibodies to c. burnetii were found in a. f ... | 1992 | 1427494 |
| mixed rickettsia-virus infection in dermacentor reticulatus imago. | electron microscopic examination revealed replication and accumulation of rickettsia sibirica in the fat body of experimentally infected dermacentor reticulatus ticks. rickettsia are released from the fat body cells by budding being surrounded with cytoplasm and plasmalemma of the host cell. eukaryotic cell structures have been detected consisting of lamella layers whirled around the intact rickettsiae. in addition to rickettsia, microorganisms morphologically resembling francisella tularensis a ... | 1991 | 1681715 |
| polypeptides constituting the antigenic basis for identification of rickettsia sibirica species by the standard serotyping method for spotted fever group rickettsiae. | the antigens of rickettsia sibirica, rickettsia rickettsii, and rickettsia conorii were examined by western immunoblots and the standard immunofluorescent serotyping assay with mouse anti-rickettsia sibirica serum that is used for determining the species identification of spotted fever group rickettsiae. serum was employed prior to absorption and after absorption with purified native or heated rickettsia sibirica. the unabsorbed antiserum, the antiserum absorbed with heated rickettsia sibirica a ... | 1990 | 1697727 |
| [the ultrastructure of the interaction of rickettsia sibirica and r. slovaca with the cells of ixodid ticks]. | the ultrastructural aspects of the interaction of r. sibirica and r. slovaca with cells of mites of the species dermacentor reticulatus, d. marginatus and ixodes ricinus after their parenteral infection, as well as in the organs of d. marginatus infected naturally in the environment, have been studied. both rickettsial species have similar morphology in different organs of the vector. these rickettsiae not only multiply, their populations are also partly destroyed in phagolysosomes. the natural ... | 1991 | 1867038 |
| [serodiagnosis of scrub typhus by dot-blot method]. | microimmunofluorescence (if) and immunoperoxidase tests are generally used for the serodiagnosis of scrub typhus. while these tests give satisfactory results in the hands of experienced personnel, they can be troublesome for inexperienced technicians. to develop a simpler diagnostic method, dot-blot assay was examined in this study. six antigenically distinctive strains of gilliam, karp, kato, shimokoshi, kawasaki and kuroki of rickettsia tsutsugamushi and a strain of rickettsia sibirica were do ... | 1990 | 2119408 |
| [isolation and identification of the w-88 strain of spotted fever group rickettsiae from a human case in tongliao city, inner mongolia]. | one strain of spotted fever group (sfg) rickettsiae was isolated from a patient with febrile and headache who was missdiagnosed as common cold. the rickettsia was isolated by inoculation of yolk sacs of embryonated hen eggs with the patient's blood. the isolate was named as w-88 following the initial letter of the patient's name. it is the first time to report the isolation of sfg rickettsiae from human being who lived in city in china. in this study we compared the antigens of w-88 strain with ... | 1990 | 2225005 |
| serologic survey for antibodies to rickettsia sibirica in inner mongolia, people's republic of china. | | 1990 | 2378450 |
| [characteristics of the transphase and transovarial transmission of rickettsia sibirica by ixodid and argasid ticks]. | both the specific vector dermacentor silvarum and the nonspecific one ornithodoros papillipes are shown to become rickettsia sibirica infected while sucking blood on the infected guinea pigs. meanwhile, the specific vector d. silvarum is more sensitive to r. sibirica than the nonspecific. o papillipes. the infectivity of d. silvarum and o. papillipes ticks by r. sibirica was found to be dependent on the intensity of guinea pigs' rickettsemia. transovarial transmission of rickettsia has been esta ... | 1989 | 2811744 |
| ultrastructure of rickettsia sibirica during interaction with the host cell. | rickettsia sibirica (strain netsvetaev) was found within large translucent spaces in the cytoplasm of l-929 cell monolayer cultures on day 6 postinfection (p.i.). these rickettsiae were rod shaped 0.3 x 10 microns in size encircled by a halo of up to 200 nm wide corresponding to a capsule-like coat. directly on the cell wall was a 12 nm thick microcapsule in which subunit structures with 12 nm thick spacing could be recognized. the cell wall membrane was 14 nm thick with a wider internal layer o ... | 1986 | 2881469 |
| barbash strain spotted fever group rickettsia is a strain of rickettsia conorii and differs from rickettsia sibirica. | the barbash strain of spotted fever group rickettsia was reexamined in this study by the microimmunofluorescence test with mouse antisera and with monoclonal antibodies. protein immunoblotting was performed for comparison of purified antigens of r. rickettsii, r. sibirica, r. conorii and barbash strain. comparison of barbash strain, r. rickettsii (sheila smith strain), r. conorii (malish 7 strain), and r. sibirica (strains 232, 246 and jinghe-74) of the spotted fever group in the microimmunofluo ... | 1987 | 2894143 |
| production and characterization of cloned t-cell hybridomas that are responsive to rickettsia conorii antigens. | t-cell hybridomas produced by the fusion of rickettsia conorii immune t cells to the akr thymoma bw 5147 produced interleukin-2 when stimulated with the antigens of three different r. conorii strains. one cloned hybridoma responded only to r. conorii antigens, whereas a second and third cloned hybridoma also responded to the antigens of rickettsia rickettsii sheila smith and rickettsia sibirica 246, respectively. antigen responses required antigen-presenting cells, and this interaction was major ... | 1986 | 3082761 |
| [dynamics of rickettsemia in common voles and steppe lemmings with different infective doses of rickettsia sibirica]. | | 1985 | 3897820 |
| interaction of rickettsiae with haemocytes of alveonasus lahorensis ticks. | the development of different rickettsial species (rickettsia sibirica, r. conorii, r. acari and coxiella burnetii) in haemocytes of alveonasus lahorensis ticks was compared by viral observations and time-lapse cine-micrography. the interaction of different rickettsial species with the haemocytes in vitro had specific characteristic features and reflected the pattern of interaction of the rickettsiae with tick cells in vivo. | 1980 | 6107037 |
| [experimental tick-borne rickettsiosis in murine rodents]. | the comparative study of the duration and level of rickettsiemia in wild rodents, natural carriers of rickettsiosis, after their experimental infection with rickettsia sibirica has been carried out. all those species under study (common voles, meadow mice and great gerbils) have been found to be faintly susceptible to this infective agent. large infective doses produce no visible signs of the disease in these animals, rickettsiemia for a short time and its level is not high. great gerbils have b ... | 1983 | 6342312 |
| susceptibility of inbred mice to rickettsiae of the spotted fever group. | a mouse strain susceptible to lethal infection with rickettsia conorii was required for testing vaccine efficacy and for studying the immunology and pathogenesis of infection. among 20 strains of inbred mice inoculated intraperitoneally with the malish strain of r. conorii, the c3h/hej mouse strain was the most susceptible, with a 50% lethal dose of approximately 10 pfu. infection of all mouse strains resulted in a measurable antibody response; the highest titers correlated with the greatest deg ... | 1984 | 6418657 |
| [action of tetracycline and rifampicin on rickettsia prowazekii and rickettsia sibirica]. | the effect of tetracycline and rifampicin on r. prowazekii, strain breinl and r. sibirica, strain x1 was studied in the experiments with chick embryos exposed to the antibiotic mixture with the infection material. it was shown that tetracycline in doses of 0.1 and 1 mg/embryo had the rickettsiostatic and rickettsiocidic effects respectively on r. sibirica. rifampicin had only the rickettsiostatic effect in a dose of 0.1 mg/embryo and no rickettsiocidic effect even in a dose of 2 mg/embryo. highe ... | 1982 | 6816142 |
| evidence for a high prevalence of spotted fever group rickettsial infections in diverse ecologic zones of inner mongolia. | a 3-year study of spotted fever group rickettsial ecology in inner mongolia revealed that nearly half of the human population tested had antibodies to rickettsia sibirica detected by complement fixation test. infected persons, ticks and a high proportion of seropositive livestock and wild rodents were found in all five vegetation zones (desert, steppe, forest, forest-grassland and grassland). | 1995 | 7641832 |
| [the typology of natural foci of tick-borne rickettsiosis]. | the authors have developed a typological classification of tick-borne rickettsiosis foci by the type of the main carrier by identifying 6 major types out of which the dermacentor steppe and partially wooded steppe foci are most extensive and epidemiologically significant. they provide a spatial and functional characterization of the foci of this infection within the currently known rickettsia sibirica area, which is applicable to make epidemiological predictions and differential preventive measu ... | 1994 | 7715555 |
| phylogenetic position of rickettsia tsutsugamushi and the relationship among its antigenic variants by analyses of 16s rrna gene sequences. | the 16s rrna gene sequences of rickettsia tsutsugamushi and rickettsia sibirica were determined by pcr and dna sequencing. phylogenetic analysis revealed that r. sibirica is positioned in a cluster of the genus rickettsia with a similarity value of 98.1-99.6%, whereas r. tsutsugamushi is located apart from the cluster with a similarity value of 90.2-90.6%. this evidence suggests that r. tsutsugamushi should be excluded taxonomically from the genus rickettsia. the phylogenetic classification of s ... | 1995 | 7875578 |
| proteinic and genomic identification of spotted fever group rickettsiae isolated in the former ussr. | sodium dodecyl sulfate-polyacrylamide gel electrophoresis (sds-page), restriction fragment length polymorphism of polymerase chain reaction-amplified genes (rflp-pcr), and pulsed-field gel electrophoresis (pfge) were used to identify 25 isolates of spotted fever group rickettsia collected in the former ussr. six rickettsia akari isolates which were identical to the mk reference strain from the american type culture collection were found. also, 14 isolates were found to be rickettsia sibirica and ... | 1993 | 7902843 |
| genotypic and antigenic identification of two new strains of spotted fever group rickettsiae isolated from china. | four isolates of spotted fever group rickettsiae isolated from ticks in china were compared with all known species and strains of spotted fever group rickettsiae by immunofluorescence assay, dna polymerase chain reaction followed by restriction endonuclease fragment length polymorphism analysis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and western immunoblot. the chinese isolates belonged to three types, including a novel serotype which has not been described before. one isolat ... | 1993 | 8093253 |
| [genotypic characteristics of rickettsia sibirica strains]. | six rickettsia sibirica strains isolated in siberia and far east (primorje) from various sources (patient, ticks d. nuttali, d. silvarum, h. concinna) at different time (1940-1980) were studied by the rflp and dna probe hybridization techniques. all studied strains were found to have the identical profiles of migrating fragments in restrictograms got by using a set of endonucleases (ecori, psti, pvuii, bg1i, xbai, hindiii, mspi) and similar zones of hybridization with a dna probe derived from ri ... | 1993 | 8103913 |
| [spotted fever group rickettsiosis and vectors in kanagawa prefecture]. | primer pairs for pcr were designed from the gene encoding the 17,000-molecular-weight genus-common antigen of rickettsia japonica, rickettsia rickettsii, rickettsia conorii, rickettsia typhi and rickettsia prowazekii. primers r1, r2 were designed for amplifying the genomic dna from spotted fever group (sfg) rickettsiae and epidemic typhus rickettsiae. primers rj5, rj10 were designed for amplifying the genomic dna from only r. japonica. using the primers r1, r2, about a 540-bp fragment was observ ... | 1996 | 8741704 |
| biological and genetic characterization of rickettsia sibirica strains isolated in the endemic area of the north asian tick typhus. | restriction fragment length polymorphism (rflp) analysis of polymerase chain reaction-amplified gene fragments was used to characterize 24 isolates of spotted fever group rickettsiae previously identified as rickettsia sibirica from their serologic properties. these strains were obtained in russia between 1946 and 1991 from humans and different species of ixodid ticks. the rflp analysis was performed using amplified dna products obtained with a genus-specific primer pair derived from the r. prow ... | 1996 | 9025699 |
| citrate synthase gene comparison, a new tool for phylogenetic analysis, and its application for the rickettsiae. | using pcr and an automated laser fluorescent dna sequencer, we amplified and sequenced a 1,234-bp fragment of the citrate synthase-encoding gene (glta) of 28 bacteria belonging to the genus rickettsia. comparative sequence analysis showed that most of the spotted fever group (sfg) rickettsiae belonged to one of two subgroups. the first subgroup included rickettsia massiliae, strain bar 29, rickettsia rhipicephali, "rickettsia aeschlimanni," and rickettsia montana, which have been isolated only f ... | 1997 | 9103608 |
| high concentration of recombinant murine interferon-beta enhances the growth of orientia (formerly rickettsia) tsutsugamushi gilliam in mouse l929 cells. | we studied the effect of recombinant murine interferons (rmuifns) on the growth of orientia (formerly rickettsia) tsutsugamushi gilliam in mouse l929 cells. rickettsial growth was measured by flow cytometry. rmuifn-gamma inhibited the growth of o. tsutsugamushi at the concentrations of 100 i.u./ml and 1,000 i.u./ml in accord with previous reports. relatively low concentrations (10 i.u./ml and 100 i.u./ml) of rmuifn-beta also inhibited the growth of o. tsutsugamushi. on the other hand, high conce ... | 1997 | 9219637 |
| taxonomic relationships among spotted fever group rickettsiae as revealed by antigenic analysis with monoclonal antibodies. | the spotted fever group (sfg) is made up of more than 20 different rickettsial species and strains. study of the taxonomic relationships among the group has been attempted by phenotypic, genotypic, and phylogenetic analyses. in this study, we determined taxonomic relationships among the sfg rickettsiae by comparative analysis of immunogenic epitopes reactive against a panel of monoclonal antibodies. a total of 98 monoclonal antibodies, which were directed against epitopes on the major immunodomi ... | 1998 | 9542904 |
| detection of rickettsia sibirica in ticks and small mammals collected in three different regions of china. | the primers rr 190.70p and rr 190.602n were used to detect spotted fever group (sfg) rickettsiae by polymerase chain reaction (pcr) in ticks and small mammals collected in three different regions of china. the obtained results indicated that specific dna fragments of sfg rickettsiae were amplified from dermacentor silvarum, d. sinicus, d. auratus, haemaphysalis concinna, h. wellingtoni, h. yeni, apodemus agrarius, microtus fortis. clethrionomys rufocanus, ondatra zibethica, rattus flavipectus an ... | 1998 | 9645245 |
| phylogenetic analysis of spotted fever group rickettsiae by study of the outer surface protein rompa. | rickettsiae are classified in the order rickettsiales and have been included in the alpha subclass of the class proteobacteria on the basis of 16s rrna gene sequence comparison. to estimate the evolutionary forces that have shaped the members of the spotted fever group (sfg) rickettsiae, the ompa gene (apart from the tandem repeat units), encoding an antigenic high-molecular-mass membrane protein specific for the group, was amplified and sequenced from 21 isolates. the phylogenetic relationship ... | 1998 | 9734038 |
| [detection of north-asia tick-borne spotted fever in ticks and rodents along the heilongjiang river-side by restriction fragment length polymorphism of pcr products]. | in order to elucidate the natural foci of north-asia tick-borne spotted fever along the bank of heilongjiang river, we used pcr/rflp to detect spotted fever group rickettsiae in ticks and rodents. the results showed that the wild samples of dermacentor silvarum, haemaphysalis concinna and apodemus agrarius, microtus fortis, clethrionomys rufocanus and ondatra zibethica were all positive with amplification, but typhus rickettsiae, tsutsugamushi fever rickettsiae and q fever rickettsiae were all n ... | 1997 | 9812471 |
| [a molecular epidemiologic investigation of north asia fever in scenic spots of beijing suburb]. | pcr/rflp technique was used to detect spotted fever group rickettsiae (sfgr) in ticks and small mammals collected in eleven scenic spots of beijing suburb. we not only detected rickettsia sibirica in d. sinicus and hedgehog collected nearby the museum of aviation, but also isolated two strains of sfgr from them, named as bj-95 strain and bjh-95 strain respectively. the two strains were identified as r. sibirica by sds-page, western blot and pcr/rflp. the results demonstrated the existence of hor ... | 1997 | 9812516 |
| molecular phylogeny and rearrangement of rrna genes in rickettsia species. | 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(met) formyltransferase (fmt). in this study, we screened the genus rickettsia for the fmt-rrl motif in ... | 1999 | 10406115 |
| new rickettsiae in ticks collected in territories of the former soviet union. | dermacentor nuttallii from siberia, rhipicephalus sanguineus from crimea, and rh. pumilio from the astrakhan region were infected with rickettsia sibirica (12%), r. conorii (8%), and the astrakhan fever agent (3%), respectively. three new rickettsiae of the r. massiliae genogroup were identified in ticks by 16s rdna, glta, and ompa sequencing. | 1999 | 10603217 |
| phylogeny of rickettsia spp. inferred by comparing sequences of 'gene d', which encodes an intracytoplasmic protein. | 'gene d' is the ps120-protein-encoding gene, first described in rickettsia conorii and rickettsia japonica. sequence analysis of a 3030 bp fragment of 'gene d' in 24 representatives of the genus rickettsia was carried out to complete phylogenetic analyses previously inferred by comparison of gene sequences encoding citrate synthase, 17 kda antigen and rompa and rompb. the phylogenetic relationships between rickettsiae were inferred from the comparison of both the gene and the derived protein seq ... | 2001 | 11491333 |
| [the onset of chronic lyme-borreliosis after the cure of tick-borne rickettsia infection in simultaneous infection]. | a case of a male patient with chronic lyme borreliosis running with marked neurological symptoms (garin-bujardoux-bannwarth syndrome) is reported. two years before the disease manifestation the patient was infected by the tick with both borrelia and rickettsia sibirica. the latter infection provoked an acute fever in tick-borne rickettsiosis immediately after the tick's bite. this masked development of lyme borreliosis which manifested only 5 months later as a neurological disease. it is thought ... | 2002 | 12138808 |
| using pcr/rflp to detect spotted fever group rickettsia in ticks and rodents collected in ninghua, fujian province. | to study the existence of natural foci of spotted fever in ninghua, fujian province. | 2002 | 12410964 |
| [cloning and sequence analysis of rompa gene fragment of spotted fever group rickettsiae isolated in china]. | rr 190.70 p-602 n primers were used to amplify the rompa gene fragment of prototype strains (rickettsia sibirica 246 strain and r. parkeri) and chinese strains (bj-90, ha-91 and hlj-054) of spotted fever group rickettsiae (sfgr). the pcr products were cloned into pgem-t vector respectively and sequenced by sanger's dideoxy method. the sequences of the tested strains were compared with the corresponding regions of prototype and reference strains of sfgr. the results showed that the homology of ro ... | 1998 | 12549415 |
| [is rickettsia sibirica influenced by the feeding of ticks living on immune animals?]. | | 1964 | 14197228 |
| [study on spotted fever group rickettsiae in guangdong province]. | to explore the existence of spotted fever group rickettsiae (sfgr) in guangdong province. | 2003 | 14521792 |
| rickettsia sibirica infection in members of scientific expeditions to northern asia. | the risk of acquiring north asian tick typhus (infection by rickettsia sibirica) during travel to regions of asia where this disease is endemic is unknown. we investigated prospectively 13 paleontologists on expedition to mongolia. four paleontologists had acute illness characterised by fever, rash, headache, and lymphadenopathy. all had igm and igg antibodies to r sibirica. paleontologists with no illness and people who went on expeditions in other parts of the world did not have antibodies to ... | 2003 | 14568744 |
| rickettsia species infecting amblyomma cooperi ticks from an area in the state of são paulo, brazil, where brazilian spotted fever is endemic. | owing to the potential role of the tick amblyomma cooperi in the enzootic cycle of rickettsia rickettsii, the etiologic agent of brazilian spotted fever (bsf), this study evaluated infection by rickettsia species in a. cooperi ticks collected from an area in brazil where bsf is endemic. among a total of 40 a. cooperi adult ticks collected in an area of bsf endemicity in the state of são paulo, pcr analysis detected dna of rickettsia bellii in 16 ticks (40%), and 3 other ticks (7.5%) were positiv ... | 2004 | 14715737 |
| protein interaction mapping on a functional shotgun sequence of rickettsia sibirica. | protein interaction maps can reveal novel pathways and functional complexes, allowing 'guilt by association' annotation of uncharacterized proteins. to address the need for large-scale protein interaction analyses, a bacterial two-hybrid system was coupled with a whole genome shotgun sequencing approach for microbial genome analysis. we report the first large-scale proteomics study using this system, integrating de novo genome sequencing with functional interaction mapping and annotation in a hi ... | 2004 | 14872061 |
| rickettsial infections--a threat to travellers? | recent developments in cell-culture techniques and molecular methods have led to the description of several new rickettsial diseases. an update on these new infections should be of interest to health workers with patients who are international travellers. | 2004 | 15353963 |
| seroepidemiology of spotted fever group and typhus group rickettsioses in humans, south korea. | the prevalence of spotted fever group (sfg) and typhus group (tg) rickettsioses was investigated in 3,362 sera by immunofluorescence assay. the serum samples were obtained from patients with acute febrile episodes in south korea from december 1992 to november 1993. the number of polyvalent positive sera against sfg rickettsial agents at the level of 1: 40 dilution was 269 (8%) in rickettsia sibirica, 482 (14.34%) in r. conorii, and 546 (16.24%) in r. akari. many of the positive sera contained im ... | 2005 | 15665449 |
| lymphangitis-associated rickettsiosis, a new rickettsiosis caused by rickettsia sibirica mongolotimonae: seven new cases and review of the literature. | rickettsia sibirica mongolotimonae has been found in hyalomma ticks in inner mongolia (in china) and niger and in humans in france and south africa. to date, only 3 cases of human infection have been reported. | 2005 | 15844066 |
| detection of spotted fever group (sfg) rickettsiae in dermacentor reticulatus (acari: ixodidae) in poland. | dermacentor reticulatus ticks from poland were investigated by molecular methods for the presence of rickettsiae. during 2003/2004, a total of 285 adult ticks was assayed using primers rpcs.877 and rpcs.1258 derived from the citrate synthase (glta) gene, and 116 samples (40.7%) were positive for rickettsial dna. ten out of these positive samples were further assayed using slo1f and slo1r primers derived form the rompa-encoding gene to confirm that detected rickettsiae belong to the spotted fever ... | 2006 | 16524778 |
| molecular identification of a collection of spotted fever group rickettsiae obtained from patients and ticks from russia. | thirty-one rickettsial isolates from ticks or patients in north asian tick typhus (natt) foci from the ural region to the russian far east were obtained at the omsk research institute of natural foci infections between 1954 and 2001. using citrate synthase (glta) and outermenbrane protein a (ompa) gene sequencing, we identified these isolates as rickettsia sibirica sensu stricto (25 isolates), r. sibirica strain bj-90 (2 isolates), r. slovaca (1 isolate), and r. heilongjiangensis (3 isolates). w ... | 2006 | 16525104 |
| genetic differentiation of chinese isolates of rickettsia sibirica by partial ompa gene sequencing and multispacer typing. | current data on rickettsiae and rickettsial diseases in china remain limited. using partial ompa gene sequencing and multispacer typing, we identified 15 rickettsial isolates from china. all isolates were found to belong to rickettsia sibirica subsp. sibirica. four isolates from dermacentor sinicus collected in beijing, china, were fully identical to strain bj-90, previously demonstrated to belong to r. sibirica subsp. sibirica despite antigenic and genotypic specificities. all 11 remaining isol ... | 2006 | 16825365 |
| rickettsia sibirica isolation from a patient and detection in ticks, portugal. | we report the first isolation of rickettsia sibirica (strain mongolotimonae) from the blood of a patient and detection by polymerase chain reaction (pcr) of the rickettsia in a rhipicephalus pusillus tick collected from a dead mongoose (herpestes ichneumon) in the alentejo region, portugal. we describe also the first pcr detection of a new rickettsia strain that is related to r. sibirica. | 2006 | 16836827 |
| detection of members of the genera rickettsia, anaplasma, and ehrlichia in ticks collected in the asiatic part of russia. | a total of 395 adult ixodid ticks from three genera (dermacentor, haemaphysalis, and ixodes) collected from the urals to the far east of russia were tested by pcr and sequencing for the presence of spotted fever rickettsiae, anaplasmae, and ehrlichiae. four, pathogens recognized in humans were detected in ticks: rickettsia sibirica, r. heilongjiangensis, r. helvetica, and anaplasma phagocytophilum. in addition, rickettsiae and ehrlichiae of unknown pathogenicity were detected, including ricketts ... | 2006 | 17114745 |
| proposal to create subspecies of rickettsia sibirica and an emended description of rickettsia sibirica. | the rickettsia sibirica species is composed of isolates that are genotypically close but can be classified within two distinct serotypes, that is, r. sibirica sensu stricto and r. sibirica mongolitimonae (incorrectly named r. mongolotimonae). we investigated the possibility of classifying rickettsiae closely related to r. sibirica as r. sibirica subspecies, as proposed by the ad hoc committee on reconciliation of approaches to bacterial systematics. for this, we first estimated the genotypic var ... | 2006 | 17114787 |
| spotted fever rickettsioses in southern and eastern europe. | mediterranean spotted fever due to rickettsia conorii conorii was thought, for many years, to be the only tick-borne rickettsial disease prevalent in southern and eastern europe. however, in recent years, six more species or subspecies within the spotted fever group of the genus rickettsia have been described as emerging pathogens in this part of the world. tick-borne agents include rickettsia conorii israelensis, rickettsia conorii caspia, rickettsia aeschlimannii, rickettsia slovaca, rickettsi ... | 2007 | 17266709 |
| lymphangitis in a portuguese patient infected with rickettsia sibirica. | | 2008 | 18325289 |
| rickettsia sibirica subsp. mongolitimonae infection and retinal vasculitis. | | 2008 | 18394301 |
| human rickettsia sibirica mongolitimonae infection, spain. | | 2008 | 18494099 |
| [far-eastern spotted fever: description of new infectious disease]. | historical data concerning description and identification of etiology of tick-borne spotted fever in russia are presented in the paper. review of studies shows that by uncovering the etiology of tick-borne spotted fever in the russian far east, an emerging disease may be discovered. another, different from classical rickettsia sibirica, bacteria causes spotted fever there. the application of described methods resulted in first isolation of etiological agent of far-eastern spotted fever, ricketts ... | 2008 | 18756784 |
| [nature-focal rickettsioses in mongolia. two decades of russian-mongolian scientific collaboration]. | the results of many years' studies of nature-focal rickettsioses in mongolia in collaboration of soviet (russian) and mongolian specialists under leadership of i. v. tarasevich are represented. presence of contacts of population, domestic and wild animals with coxiella burnetii and rickettsia sibirica on the territory of mongolia was established. the map of spread of ticks corresponding to their epidemiological significance was developed. methodological documents for prevention of nature-focal r ... | 2008 | 18756785 |
| molecular detection of rickettsia massiliae, rickettsia sibirica mongolitimonae and rickettsia conorii israelensis in ticks from israel. | rickettsioses are recognized as important emerging vector-borne infections of humans worldwide. previous reports documented the presence of two spotted fever group rickettsiae in israel, rickettsia conorii israelensis and rickettsia felis. the aim of this study was to characterize the diversity of rickettsiae in ticks collected from vegetation and the ground, from different parts of israel. non-engorged questing adult ticks were collected from 13 localities. a total of 131 tick pools, 83 of rhip ... | 2011 | 20331680 |
| rickettsia sibirica mongolitimonae in traveler from egypt. | | 2010 | 20735946 |
| tick-borne rickettsioses, neglected emerging diseases in rural senegal. | rickettsioses are one of the most important causes of systemic febrile illness among travelers from developed countries, but little is known about their incidence in indigenous populations, especially in west africa. | 2010 | 20856858 |
| detection of spotted fever group rickettsia in haemaphysalis longicornis in hebei province, china. | abstract dna samples from 737 ticks pools, representing 6850 haemaphysalis longicornis and 51 dermacentor nuttalli ticks collected from hebei province, china, were analyzed by pcr for the presence of spotted fever group rickettsia. there were 50 (6.9%) of 724 h. longicornis ticks pools found positive, but no positive samples found in 13 d. nuttalli. sequence analysis of the partial outer membrane protein a (ompa) genes from the ten positive samples showed 98% identity, but different from the hom ... | 2011 | 21506802 |
| investigation of anaplasmosis in yiyuan county, shandong province, china. | to investigate the situation of anaplasmosis in yiyuan county, shandong province. | 2011 | 21803311 |
| [detection by polymerase chain reaction of rickettsia sibirica mongolotimonae in the skin biopsy of a rash: a case report.] | | 2011 | 21723005 |
| spotted fever group rickettsiae in ticks in cyprus. | in two surveys conducted from march 1999 to march 2001 and from january 2004 to december 2006, a total of 3,950 ticks (belonging to ten different species) were collected from seven domestic and wild animals (goat, sheep, cattle, dog, fox, hare, and mouflon) from different localities throughout cyprus. in order to establish their infection rate with spotted fever rickettsiae (sfg), ticks were pooled and tested by polymerase chain reaction targeting glta and ompa genes, followed by sequencing anal ... | 2011 | 21833539 |
| widespread use of real-time pcr for rickettsial diagnosis. | we report 2 years of experience with rickettsial molecular diagnosis using real-time pcr at the french national reference center. all rickettsia genomes available were compared to discover specific sequences to design new sets of primers and probes. the specificity was verified in silico and against a panel of 30 rickettsial species. sensitivity was determined using 10-fold serial dilutions. finally, primers and probes that were both specific and sensitive were routinely used for the diagnosis o ... | 2011 | 22092999 |
| sequence and annotation of rickettsia sibirica sibirica genome. | rickettsia sibirica sibirica is the causative agent of siberian or north asian tick typhus, a tick-borne rickettsiosis known to exist in siberia and eastern china. here we present the draft genome of rickettsia sibirica sibirica strain bj-90 isolated from dermacentor sinicus ticks collected in beijing, china. | 0 | 22493192 |
| rickettsia africae and candidatus rickettsia barbariae in ticks in israel. | dna of several spotted fever group rickettsiae was found in ticks in israel. the findings include evidence for the existence of rickettsia africae and candidatus rickettsia barbariae in ticks in israel. the dna of r. africae was detected in a hyalomma detritum tick from a wild boar and dna of c. rickettsia barbariae was detected in rhipicephalus turanicus and rhipicephalus sanguineus collected from vegetation. the dna of rickettsia massiliae was found in rh. sanguineus and haemaphysalis erinacei ... | 2014 | 24615133 |
| clustered cases of rickettsia sibirica mongolitimonae infection, france. | | 0 | 23460995 |
| human infection with rickettsia sibirica mongolitimonae, spain, 2007-2011. | human infection with rickettsia sibirica mongolitimonae was initially reported in 1996, and reports of a total of 18 cases have been published. we describe 6 additional cases that occurred in the mediterranean coast region of spain during 2007-2011. clinicians should consider this infection in patients who have traveled to this area. | 0 | 23343524 |
| genome sequence of "rickettsia sibirica subsp. mongolitimonae". | "rickettsia sibirica subsp. mongolitimonae" is the agent of lymphangitis-associated rickettsiosis, an emerging human disease that has been diagnosed in europe and africa. the present study reports the draft genome of rickettsia sibirica subsp. mongolitimonae strain ha-91. | 0 | 22493199 |
| coinfection with "rickettsia sibirica subsp. mongolotimonae" and rickettsia conorii in a human patient: a challenge for molecular diagnosis tools. | rickettsioses are zoonoses transmitted by vectors. more than one agent can coexist in vectors. although vectors may transmit more than one microorganism to humans, information on dual infections is scarce. we present a case of a patient with an atypical rickettsiosis diagnosis in whom two species of rickettsia were detected. | 2015 | 26135877 |
| detection of rickettsia sibirica mongolitimonae by using cutaneous swab samples and quantitative pcr. | | 0 | 24655579 |
| scalp eschar and neck lymphadenopathy after tick bite: an emerging syndrome with multiple causes. | the clinical and epidemiological features of 56 patients with scalp eschar associated with neck lymphadenopathy after a tick bite (senlat) syndrome were evaluated at the national french rickettsial center. eschar swabs, crusts, and biopsies as well as ticks and blood samples were acquired for molecular and serological assays. senlat predominantly affects children (p < 0.05), followed by 40- to 70-year-olds, and it is found mostly in women (p < 0.05). the seasonal distribution has two peaks: one ... | 2014 | 24682865 |
| molecular analysis of crimean-congo hemorrhagic fever virus and rickettsia in hyalomma marginatum ticks removed from patients (spain) and birds (spain and morocco), 2009-2015. | crimean-congo hemorrhagic fever virus (cchfv) was detected in spain in 2010. the presence of cchfv in hyalomma marginatum ticks from migratory birds passing through morocco during the spring migration strengthened the hypothesis of the arrival of infected ticks transported by birds to the iberian peninsula. furthermore, hyalomma species are vectors of bacterial infections such as spotted fever rickettsioses. cchfv and rickettsia were screened in hyalomma ticks from spain attached to patients (n= ... | 2016 | 27215620 |
| rickettsioses in europe. | bacteria of the genera rickettsia and orientia (family rickettsiaceae, order rickettsiales) cause rickettsioses worldwide, and are transmitted by lice, fleas, ticks and mites. in europe, only rickettsia spp. cause rickettsioses. with improvement of hygiene, the risk of louse-borne rickettsiosis (epidemic typhus) is low in europe. nevertheless, recrudescent form of rickettsia prowazekii infection persists. there could be an epidemic typhus outbreak if a body lice epidemic occurs under unfavorable ... | 2016 | 26384814 |
| molecular detection of rickettsia africae, rickettsia aeschlimannii, and rickettsia sibirica mongolitimonae in camels and hyalomma spp. ticks from israel. | in this study, we aimed to identify and genetically characterize spotted fever group (sfg) rickettsiae in ticks, domestic one-humped camels, and horses from farms and bedouin communities in southern israel. a total of 618 ixodid ticks (hyalomma dromedarii, hyalomma turanicum, hyalomma excavatum, and hyalomma impeltatum) collected from camels and horses, as well as 152 blood samples from 148 camels and four horses were included in the study. initial screening for rickettsiae was carried out by ta ... | 2013 | 24107206 |
| tick-borne rickettsioses in europe. | rickettsioses are caused by obligate intracellular bacteria within the genus rickettsia, mainly transmitted by arthropods. until recently, mediterranean spotted fever (msf) caused by rickettsia conorii was considered the only tick-borne rickettsiosis in europe. however, 'new' tbr have been described in europe during last years. for instance, other subspecies such as r. conorii caspia and r. conorii israelensis have been involved in msf. dermacentor-borne necrosis erythema and lymphadenopathy/tic ... | 2012 | 23177355 |
| rickettsial infection in ticks (acari: ixodidae) collected on birds in southern brazil. | the aim of the study was to evaluate rickettsial infection in ticks from wild birds of the semidecidual and atlantic rainforest remnants of three municipalities of the state of paraná, southern brazil. overall, 53 larvae and nymphs collected from birds were checked for the presence of rickettsia dna by molecular tests. five tick species were tested: amblyomma aureolatum (pallas), amblyomma calcaratum neumann, amblyomma longirostre (koch), amblyomma ovale koch, and amblyomma parkeri fonseca and a ... | 2012 | 22679880 |
| new evidence on tick-borne rickettsioses in the altai region of russia using primary lesions, serum and blood clots of molecular and serological study. | tick-borne rickettsioses (tbrs) have similar clinical symptoms and can give serological cross-reaction. we firstly found that in the natural foci of north asian tick typhus (natt) in the altai region of russia, tbrs can be caused by two rickettsia species: rickettsia sibirica subsp. sibirica (causative agent of natt) and rickettsia heilongjiangensis. rickettsial dna was detected in primary lesions, serum samples and blood clots using real-time pcr. therefore, each case of tbrs should be verified ... | 2016 | 26344602 |
| [rickettsiosis after tick bite: a subtle clinic picture on many occasions, we must be vigilant]. | rickettsia diseases are a group of tick-borne transmitted diseases, classified into 2 large groups: spotted fevers and typhus fevers. in addition, a new condition has been described recently, known as tick-borne lymphadenopathy. a retrospective series is presented of paediatric cases of rickettsia diseases diagnosed in 2013 and 2014. a total of 8 patients were included, of which 2 of them were diagnosed as mediterranean spotted fever, and 6 as tick-borne lymphadenopathy. rickettsia slovaca, rick ... | 2017 | 26976382 |
| molecular surveillance of spotted fever group rickettsioses in wildlife and detection of <i>rickettsia sibirica</i> in a topi (<i>damaliscus lunatus</i> ssp. <i>jimela</i>) in kenya. | spotted fever group rickettsioses are a group of tick-borne zoonotic diseases caused by intracellular bacteria of the genus rickettsia. the diseases are widely reported amongst international travellers returning from most sub-saharan africa with fever, yet their importance in local populations largely remains unknown. although this has started to change and recently there have been increasing reports of the diseases in livestock, ticks and humans in kenya, they have not been investigated in wild ... | 2017 | 28155284 |
| rickettsia sibirica mongolitimonae infection, france, 2010-2014. | to further characterize human infections caused by rickettsia sibirica mongolitimonae, we tested skin biopsy and swab samples and analyzed clinical, epidemiologic, and diagnostic characteristics of patients with a rickettsiosis. the most common (38%) indigenous species was r. sibirica mongolitimonae. significantly more cases of r. sibirica mongolitimonae infection occurred during spring and summer. | 2016 | 27088367 |
| [rickettsia sibirica mongolitimonae infection in two immunocompetent adults]. | | 2015 | 25979600 |
| [a case of severe sepsis with disseminated intravascular coagulation during rickettsia sibirica mongolitimonae infection]. | | 2015 | 25455075 |
| rickettsia sibirica subspecies sibirica bj-90 as a cause of human disease. | | 2013 | 24047079 |
| [lymphangitis-associated rickettsiosis caused by rickettsia sibirica mongolitimonae]. | rickettsia sibirica mongolitimonae was first isolated 20 years ago in asia but has now been identified on three continents. hyalomma spp. and rhipicephalus pusillus ticks are vectors but only a small number of cases have been reported to date, mainly on the mediterranean coast. this bacterium induces the lymphangitis-associated rickettsiosis, a still unfamiliar rickettsiosis that is mainly characterized by fever with a rope-like lymphangitis and/or lymphadenopathy and skin eschar occurring after ... | 2014 | 24034636 |
| retraction: first human case of rickettsia sibirica mongolotimonae infection in northern greece in a teenager from thrace. | this article has been retracted by the authors under the agreement between the editor-in-chief, masayuki saijo and authors. | 2016 | 27795477 |
| septic shock in a patient infected with rickettsia sibirica mongolitimonae, spain. | in 1996, the first human case of infection by rickettsia sibirica subsp. mongolitimonae was described in france. subsequently, other human cases were reported in the same country. the acronym lar (lymphangitis-associated rickettsiosis) has been proposed to designate this disease because lymphangitis is one of the main clinical manifestations. later, a few more cases were described in portugal, south africa, egypt, greece and spain. we report a case of r. sibirica mongolitimonae infection as a ca ... | 2012 | 22548679 |
| detection of causative agents of tick-borne rickettsioses in western siberia, russia: identification of rickettsia raoultii and rickettsia sibirica dna in clinical samples. | the main causative agent of tick-borne rickettsioses in siberia is considered to be rickettsia sibirica; however, only a few cases have been genetically confirmed. other pathogenic species of rickettsia have been detected in ixodid ticks in western siberia. the aim of this study was to detect the aetiological agents of tick-borne rickettsioses in western siberia and compare their clinical manifestations. | 2017 | 28606645 |
| rickettsia sibirica mongolitimonae infection, turkey, 2016. | in 2016, rickettsia sibirica mongolitimonae was diagnosed for a man in turkey. he had been bitten by a hyalomma marginatum tick, from which pcr detected rickettsial dna. sequence analysis of the dna identified r. sibirica mongolitimonae. immunofluorescence assay of patient serum indicated r. conorii, which cross-reacts. pcr is recommended for rickettsiosis diagnoses. | 2017 | 28628458 |
| first human case of rickettsia sibirica mongolotimonae infection in northern greece. | | 2016 | 28471602 |