| "candidatus rickettsia tarasevichiae" in ixodes persulcatus ticks collected in russia. | we collected 209 ixodes persulcatus ticks in various regions of russia, including the southern urals and western and eastern siberia. using pcr amplification and sequencing of the citrate synthase-encoding gene (glta), we detected a new rickettsial genotype, which we named "candidatus rickettsia tarasevichiae." this bacterium was found in 9.27%, 10.0%, and 20.5% of the ticks collected in western siberia, eastern siberia, and the southern urals, respectively. "candidatus rickettsia tarasevichiae" ... | 2003 | 12860621 |
| far eastern tick-borne rickettsiosis: identification of two new cases and tick vector. | we recently reported the first documented cases of a new rickettsial disease caused by rickettsia heilongjiangensis in the russian far east (far eastern tick-borne rickettsiosis). here we report the amplification of dna of r. heilongjiangensis from both the skin biopsy of an acutely ill patient and the tick removed from him prior to the disease development. the tick has been identified as haemaphysalis spp. the clinical picture was that of a spotted fever group rickettsiosis and a seroconversion ... | 2006 | 17114683 |
| prevalence of bacterial agents in ixodes persulcatus ticks from the vologda province of russia. | the prevalence of rickettsiae, ehrlichiae, and the rickettsia-like endosymbiont called montezuma relative to that of borrelia was determined in questing ixodes persulcatus (i. persulcatus) ticks collected in 2002-2003 from vologda province, russia. ehrlichia muris, anaplasma phagocytophilum, montezuma, and new spotted fever group rickettsiae were detected by polymerase chain reaction (pcr) for the first time in this area. the rickettsiae were all candidatus rickettsia tarasevichiae, the furthest ... | 2006 | 17114724 |
| detection and identification of bacterial agents in ixodes persulcatus schulze ticks from the north western region of russia. | ixodes persulcatus schultze ticks are traditionally associated with transmission of lyme disease, babesiosis, and tick-borne encephalitis. here we compared the prevalence of infection with borrelia burgdorferi, and rickettsial and ehrlichial agents in i. persulcatus ticks collected in different locations of the north western administrative region of russia. altogether, 27.7% of ticks were infected with at least one organism, while the dna of two or more bacteria was found in 11.8% of ticks teste ... | 2007 | 17767409 |
| ultrastructural evidence of the ehrlichial developmental cycle in naturally infected ixodes persulcatus ticks in the course of coinfection with rickettsia, borrelia, and a flavivirus. | ehrlichiae are small gram-negative obligately intracellular bacteria that multiply within vacuoles of their host cells and are associated for a part of their life cycle with ticks, which serve as vectors for vertebrate hosts. two morphologically and physiologically different ehrlichial cell types, reticulate cells (rc) and dense-cored cells (dc), are observed during experimental infection of cell cultures, mice, and ticks. dense-cored cells and reticulate cells in vertebrate cell lines alternate ... | 2007 | 18171109 |
| rickettsia monteiroi sp. nov., infecting the tick amblyomma incisum in brazil. | free-living adult amblyomma incisum ticks were collected in an atlantic rainforest area at intervales state park, state of s+úo paulo, brazil. from an a. incisum specimen, rickettsiae were successfully isolated in vero cell culture by the shell vial technique. rickettsial isolation was confirmed by optical microscopy, transmission electron microscopy, and pcrs targeting portions of the rickettsial genes glta, htra, rrs, and sca1 on infected cells. fragments of 1,089, 457, 1,362, and 443 nucleoti ... | 2011 | 21685169 |
| a novel rickettsia species detected in vole ticks (ixodes angustus) from western canada. | the genomic dna of ixodid ticks from western canada was tested by pcr for the presence of rickettsia. no rickettsiae were detected in ixodes sculptus, whereas 18% of the i. angustus and 42% of the dermacentor andersoni organisms examined were pcr positive for rickettsia. the rickettsiae from each tick species were characterized genetically using multiple genes. rickettsiae within the d. andersoni organisms had sequences at four genes that matched those of r. peacockii. in contrast, the rickettsi ... | 2013 | 24077705 |
| characterization of rickettsiae in ticks in northeastern china. | tick-borne rickettsioses are considered important emerging zoonoses worldwide, but their etiological agents, rickettsiae, remain poorly characterized in northeastern china, where many human cases have been reported during the past several years. here, we determined the characteristics of rickettsia spp. infections in ticks in this area. | 2016 | 27623998 |
| rickettsia infection in amblyomma tonelliae, a tick species from the amblyomma cajennense complex. | the present study was performed to evaluate the rickettsia infection in amblyomma tonelliae ticks from argentina. all ticks were subjected to dna extraction and tested by a battery of pcrs to amplify fragments of four rickettsial genes, 23s-5s, glta, ompa and htra. two ticks were positive. the rickettsia detected in one tick represents a new lineage which is named rickettsia sp. strain el tunal. this new strain belongs to the canadensis group because it is closely related to rickettsia monteiroi ... | 2015 | 25544308 |
| genetic variability of rickettsia spp. in ixodes persulcatus ticks from continental and island areas of the russian far east. | rickettsia spp. are intracellular gram-negative bacteria transmitted by arthropods. two potentially pathogenic rickettsiae, candidatus rickettsia tarasevichiae and rickettsia helvetica, have been found in unfed adult ixodes persulcatus ticks. the aim of this study was to assess the prevalence and genetic variability of rickettsia spp. in i. persulcatus ticks collected from different locations in the russian far east. in total, 604 adult i. persulcatus ticks collected from four sites in the khaba ... | 2016 | 27424272 |
| diversity of spotted fever group rickettsia infection in hard ticks from suifenhe, chinese-russian border. | in order to investigate the diversity of spotted fever group (sfg) rickettsia infection in hard ticks, ticks were harvested from the forest areas in suifenhe city, along the chinese-russian border and conventional pcr was carried out using universal sfg rickettsia primers targeting glta and ompa genes to screen for their infection with sfg rickettsia organisms. results showed that of the 215 ticks belonging to ixodes persulcatus, haemaphysalis concinna and haemaphysalis japonica warburton, 1908 ... | 2016 | 26976703 |
| genetic variability of rickettsia spp. in ixodes persulcatus/ixodes trianguliceps sympatric areas from western siberia, russia: identification of a new candidatus rickettsia species. | rickettsia spp. are the causative agents of a number of diseases in humans. these bacteria are transmitted by arthropods, including ixodid ticks. dna of several rickettsia spp. was identified in ixodes persulcatus ticks, however, the association of ixodes trianguliceps ticks with rickettsia spp. is unknown. in our study, blood samples of small mammals (n=108), unfed adult i. persulcatus ticks (n=136), and i. persulcatus (n=12) and i. trianguliceps (n=34) ticks feeding on voles were collected in ... | 2015 | 26190452 |
| distribution and molecular characteristics of rickettsiae found in ticks across central mongolia. | little is known regarding tick-borne diseases in mongolia, despite having 26% of the population still living nomadic pastoral lifestyles. a total of 1497 adult unfed ticks: 261 ixodes persulcatus, 795 dermacentor nuttalli, and 441 hyalomma asiaticum, were collected from three ecologically distinct regions in central mongolia. tick pools (n = 299) containing ~5 ticks each, were tested for rickettsia and tick-borne encephalitis virus (tbev) using nested polymerase chain reaction, reverse transcrip ... | 2017 | 28153052 |
| detection and genetic characterization of a wide range of infectious agents in ixodes pavlovskyi ticks in western siberia, russia. | the ixodes pavlovskyi tick species, a member of the i. persulcatus/i. ricinus group, was discovered in the middle of the 20(th) century in the russian far east. limited data have been reported on the detection of infectious agents in this tick species. the aim of this study was to investigate the prevalence and genetic variability of a wide range of infectious agents in i. pavlovskyi ticks collected in their traditional and recently invaded habitats, the altai mountains and novosibirsk province, ... | 2017 | 28545549 |
| the burden of tick-borne diseases in the altai region of russia. | this article presents the results of a comprehensive survey of the burden of tick-borne infectious diseases (tbids) in the altai region of russia. official data for tbid incidence were analyzed and 201 samples from patients with suspected tbid were studied. furthermore, questing ticks and ticks recovered from humans were examined to estimate prevalence of tbid-causative agents. the altai region was determined to have a heightened risk for tbids in russia. the most epidemiologically significant t ... | 2017 | 28648773 |
| candidatus rickettsia tarasevichiae infection in eastern central china: a case series. | human infection with candidatus rickettsia tarasevichiae (crt) was first reported in northeastern china in 2012. | 2016 | 27019406 |
| prevalence of candidatus rickettsia tarasevichiae-like bacteria in ixodid ticks at 13 sites on the chinese-russian border. | to investigate the likely source population and candidate vectors of candidatus rickettsia tarasevichiae, the prevalence of this bacteria was quantified in specimens of four tick species that mainly parasitize humans collected from 13 sites along the chinese-russian border. the presence of the bacteria was determined by detecting its specific citrate synthase (glta) partial gene and outer membrane protein a (ompa) partial gene. only ixodes persulcatus schulze was found to be naturally infected w ... | 2014 | 26309321 |
| human infection with candidatus rickettsia tarasevichiae. | | 2013 | 24047080 |
| detection of a novel rickettsia (alphaproteobacteria: rickettsiales) in rotund ticks (ixodes kingi) from saskatchewan, canada. | a novel rickettsia was detected in the rotund tick, ixodes kingi bishopp, 1911, based on comparative dna sequence analyses of 4 genes; the rickettsial-specific 17-kda antigen gene, citrate synthase gene (glta), the outer surface membrane protein a gene (ompa), and the 16s rrna gene. the rickettsiae in i. kingi differed in nucleotide sequence from those of other rickettsia species by 5.8-18.3% for the 17-kda gene, 0.9-13.9% for glta, 5.5-22.8% for ompa, and 0.9-1.6% for the 16s rrna gene. phyloge ... | 2013 | 23419865 |