| [determination of natural foci of tularemia in the tuva assr]. | eleven strains of tularemia causative agents were isolated in 1974 in bacteriological study of ixodes ticks dermacentor nuttalli (13088 in all) by biotests on albino mice. tularemia was confirmed retrospectively in two humans who contracted the disease from ondatra cadavers. skin allergic test with tularin was used to examine 1733 residents of seven populated localities; a positive result was obtained in 2 persons. finally, in examination of 240 sera of cattle agglutination reaction proved to b ... | 1976 | 1266472 |
| [the development of methods for the absolute count of the population of ixodid pasture ticks in open landscapes. 3. the count of hungry dermacentor nuttalli olen., 1919 larvae and nymphs in the steppe regions of the transbaikal area]. | methods for absolute registration of the number of hungry larvae and nymphs directly in the places of their natural habitation have been elaborated. specific features of the activation of these phases in transbaikal conditions have been studied. peaks of their seasonal activity can be observed in july. it has been shown that the results of single (during seasonal peak in their number) capture of larvae and nymphs from all animal holes over a 100 m2 area can be used for characterization of densit ... | 1991 | 1770885 |
| [development of methods for the absolute count of the population density of pasture ixodid ticks in open landscapes. 2. an attempt at direct trapping of hungry larvae and nymphs of dermacentor nuttalli olen]. | | 1988 | 3045514 |
| [development of methods for an absolute count of the population of ixodid ticks in open landscapes. 1. absolute count of the population of the hungry adult dermacentor nuttalli olen, 1929 in the steppe zone of the transbaikalia]. | | 1988 | 3367861 |
| isolation of a spotted fever group rickettsia from a patient and related ecologic investigations in xinjiang uygur autonomous region of china. | investigation of patients, healthy persons, and ticks in jinghe county, xinjiang uygur autonomous region, people's republic of china, for evidence of spotted fever group (sfg) rickettsiosis demonstrated strong evidence for a high prevalence of pathogenic sfg rickettsiae. antibodies to sfg rickettsiae were detected in 62.5% of healthy subjects tested by enzyme-linked immunosorbent assay and 20% tested by complement fixation test. two febrile patients were documented as having acute spotted fever ... | 1987 | 3571471 |
| rickettsial and serologic evidence for prevalent spotted fever rickettsiosis in inner mongolia. | a field study in northeastern inner mongolia, people's republic of china, in june of 1985 demonstrated a spotted fever group rickettsiosis. two strains of spotted fever group rickettsiae were isolated. one strain was obtained from the blood of a patient with an eschar, regional lymphadenopathy, and history of a recent tick bite. the other strain originated from ova of ticks, dermacentor nuttalli. these represent the second isolate of a spotted fever group rickettsia from a human and the first is ... | 1987 | 3578658 |
| babesiosis in china. | the importance of babesiosis in livestock in china is discussed and mainly focused on bovine and equine babesiosis. babesiosis is still one of the most important diseases affecting livestock and has caused great economic loss. nine species of babesia have been recognized in livestock: b. bigemina, b. bovis, b. major, b. motasi, b. ovis, b. perroncitoi, b. trautmanni, b. equi (theileria equi), b. caballi. the distribution of babesia follows the distribution of the tick vectors. the main vectors o ... | 1997 | 9512738 |
| [combined focus of tick-borne encephalitis, tick-borne rickettsiosis and tularemia in the habitat of haemaphysalis concinna in south central siberia]. | for the first time in the krasnoyarsk region the population haemaphysalis concinna ticks were found to be infected with the causative agents of three natural focal tick-borne infections--tick-borne encephalitis, tick-borne rickettsiosis and tularemia. the existence of the combined natural focus of these three infections has been confirmed by epidemiological data. ticks dermacentor nuttalli also play a similar role in combined foci of tick-borne encephalitis and tick-borne rickettsiosis in these ... | 2001 | 11236514 |
| detection of babesia caballi and babesia equi in dermacentor nuttalli adult ticks. | ticks play an important role in human and veterinary medicine particularly due to their ability to transmit protozoan pathogens. in this study we have demonstrated that polymerase chain reaction (pcr) and nested pcr methods enabled detection of babesia caballi and babesia equi in field isolates of dermacentor nuttalli adult ticks from mongolia. primers specific for 218 bp fragment merozoite antigen 1 (ema-1) gene of b. equi successfully amplified products from all samples of d. nuttalli adult ti ... | 2001 | 11306116 |
| detection of equine babesia spp. gene fragments in dermacentor nuttalli olenev 1929 infesting mongolian horses, and their amplification in egg and larval progenies. | babesia equi (ema-1) and babesia caballi (bc48) gene fragments were amplified by polymerase chain reaction (pcr), in blood samples, and partially fed-females and egg and larval progenies of dermacentor nuttalli, collected from horses in altanbulag, tuv province, mongolia. while babesia parasite dna was detected in some horse blood samples during the first pcr, all positive cases in partially fed-female ticks, eggs and larvae were confirmed by nested pcr. present study reinforces earlier similar ... | 2002 | 12237521 |
| [research on north asian rickettsiosis from the tick dermacentor nuttalli collected in one of the foci of the krasnoiarskii region]. | | 1963 | 13934994 |
| [role of pre-imaginal phases of dermacentor nuttalli in the epizootology of north asiatic rickettsiosis]. | | 1962 | 14472824 |
| [random amplified polymorphic dna analysis of the genomes among 7 species of ticks]. | to study genomic polymorphic dna and genetic distance of 7 species of ticks. | 2004 | 15587156 |
| age-dependent dynamics of theileria equi and babesia caballi infections in southwest mongolia based on ifat and/or pcr prevalence data from domestic horses and ticks. | epidemiological factors of tick-borne equine piroplasmoses, caused by theileria equi and babesia caballi, were investigated using logistic regression (glm) and general additive models (gam) based on the prevalences determined in 510 domestic horses and in ticks in s.w. mongolia by indirect immunofluorescence antibody test (ifat) and/or multiplex pcr. prevalences of t. equi and b. caballi in horses were 66.5% (95% ci: 62.1-70.7) and 19.1% (15.6-22.9), respectively by pcr and 78.8% (74.9-82.3) and ... | 2007 | 17306055 |
| ticks of small ruminants in china. | the importance of ticks and tick-borne diseases of small ruminants in china is discussed. of the 109 species of ticks identified to date in china, 45 species infest small ruminants. five species have been proved to be involved, or possibly involved, in the transmission of tick-borne diseases. anaplasma ovis, babesia motasi, babesia ovis and two unidentified species of theileria, have been recorded in small ruminants in china. the diseases caused by these organisms are widespread in china, causin ... | 2007 | 17823826 |
| rickettsia raoultii sp. nov., a spotted fever group rickettsia associated with dermacentor ticks in europe and russia. | we describe the characterization of a novel rickettsia species cultivated from dermacentor ticks collected in russia and france, for which we propose the name rickettsia raoultii sp. nov. using multigene sequencing, we demonstrated that five rickettsial isolates from dermacentor silvarum, dermacentor reticulatus, dermacentor marginatus and dermacentor nuttalli ticks were classified within this novel spotted fever rickettsia species. this rickettsia also exhibited a serotype distinct from previou ... | 2008 | 18599708 |
| 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 |
| molecular detection of anaplasma phagocytophilum in ixodid ticks in hebei province, china. | a total of 3696 ixodid ticks, collected from hebei province, china, were examined by a nested polymerase chain reaction for the presence of anaplasma phagocytophilum. forty-three (15.4%) of 280 pools tested, including 39 (14.6%) of 267 haemaphysalis longicornis and four (30.8%) of 13 dermacentor nuttalli, were positive, but no significant difference was found between d. nuttalli and h. longicornis (p>0.05). sequence and phylogenetic analyses of 16s rrna gene indicated that a. phagocytophilum in ... | 2011 | 21923254 |
| molecular detection and characterization of zoonotic and veterinary pathogens in ticks from northeastern china. | tick-borne diseases are considered as emerging infectious diseases in humans and animals in china. in this study, ixodes persulcatus (n = 1699), haemaphysalis concinna (n = 412), haemaphysalis longicornis (n = 390), dermacentor nuttalli (n = 253), and dermacentor silvarum (n = 204) ticks were collected by flagging from northeastern china, and detected for infection with anaplasma, ehrlichia, babesia, and hepatozoon spp. by using nested polymerase chain reaction assays and sequencing analysis. an ... | 2016 | 27965644 |
| 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 |
| extensive diversity of rickettsiales bacteria in two species of ticks from china and the evolution of the rickettsiales. | bacteria of the order rickettsiales (alphaproteobacteria) are obligate intracellular parasites that infect species from virtually every major eukaryotic lineage. several rickettsial genera harbor species that are significant emerging and re-emerging pathogens of humans. as species of rickettsiales are associated with an extremely diverse host range, a better understanding of the historical associations between these bacteria and their hosts will provide important information on their evolutionar ... | 2014 | 25073875 |
| natural anaplasma phagocytophilum infection in ticks from a forest area of selenge province, mongolia. | anaplasma phagocytophilum is a zoonotic agent of public health importance, infecting both humans and animals. an investigation of the presence of anaplasma phagocytophilum as well as anaplasma platys was conducted in a forest area of selenge province, mongolia, where ticks are widely distributed and tick-borne diseases are highly endemic. ticks were collected and tested using polymerase chain reaction based on groel methodology. anaplasma phagocytophilum was detected in 14 (6%) of ixodes persulc ... | 2014 | 24734213 |
| detection of babesia venatorum, anaplasma phagocytophilum and candidatus neoehrlichia mikurensis in ixodes persulcatus ticks from mongolia. | information about the prevalence and geographical distribution of tick-borne pathogens anaplasma phagocytophilum, candidatus neoehrlichia mikurensis, and babesia spp. is still rare in mongolia. we tested 275 ixodes persulcatus ticks for a. phagocytophilum, cand. n. mikurensis and babesia spp. and 125 dermacentor nuttalli ticks especially for babesia spp. using different pcr methods. ticks were collected from three provinces (selenge, arkhangai, khentii) in mongolia. dna of a. phagocytophilum, ca ... | 2016 | 26739031 |
| serologic evidence for babesia bigemina infection in wild yak (bos mutus) in qinghai province, china. | piroplasmosis, caused by tick-borne protozoan parasites of the genera theileria and babesia, is one of the most economically important infections of domestic ruminants in china. we evaluated the prevalence of antibodies to babesia bigemina in wild yaks (bos mutus) from qinghai province, china. of 91 samples, 24% had detectable b. bigemina antibodies, and significant differences in prevalence were observed between those older than 5 yr and those younger than 5 yr. we collected 1,679 ticks belongi ... | 2015 | 26267460 |
| genetic variability of babesia parasites in haemaphysalis spp. and ixodes persulcatus ticks in the baikal region and far east of russia. | to study babesia diversity in ixodid ticks in russia, ixodes persulcatus, haemaphysalis japonica, haemaphysalisconcinna, dermacentor silvarum, and dermacentor nuttalli ticks collected in the far east and baikal region were assayed for the presence of babesia spp. using nested pcr. in total, babesia dna was detected in 30 of the 1125 (2.7%) i. persulcatus, 17 of the 573 (3.0%) h. concinna, and 12 of the 543 (2.2%) h. japonica but was undetectable in any of the 294 analyzed dermacentor spp. partia ... | 2014 | 25460820 |
| the pcr detection and phylogenetic characterization of babesia microti in questing ticks in mongolia. | babesia microti is a tick-transmitted zoonotic hemoprotozoan parasite. in the present study, we investigated b. microti infection in questing ticks in mongolia. a total of 219 questing ticks were collected from three different mongolian provinces (bayan-olgii, khovsgol, and selenge). of these, 63 from selenge were identified as ixodes persulcatus, while the remaining 156 (from all three provinces) were identified as dermacentor nuttalli. when the tick dna samples were screened using a b. microti ... | 2015 | 26225461 |
| the diversity and prevalence of hard ticks attacking human hosts in eastern siberia (russian federation) with first description of invasion of non-endemic tick species. | hard ticks are the vectors of many pathogens including tick-borne encephalitis virus and the lyme disease agent borrelia burgdorferi sensu lato. in eastern siberia, ixodes persulcatus, dermacentor nuttalli, dermacentor silvarum and haemaphysalis concinna are regarded as aggressive to humans. recently, significant changes in world tick fauna have been reported and this affects the spread of tick-borne pathogens. we studied the current species diversity, population structure and prevalence of tick ... | 2016 | 26443685 |
| 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 |
| rickettsia raoultii, the predominant rickettsia found in mongolian dermacentor nuttalli. | since the year 2005, clinical patterns resembling tick-borne rickettsioses have been noticed in mongolia. epidemiological data regarding species of the aetiological agent, tick vector, prevalence, and distribution as well as incidence of human cases throughout mongolia are still sparse to date. in order to identify rickettsia species occurring in mongolia, we investigated dermacentor nuttalli (n=179) and ixodes persulcatus (n=374) collected in 4 selected provinces. rickettsia raoultii was the pr ... | 2012 | 22784401 |
| the first molecular evidence of severe fever with thrombocytopenia syndrome virus in ticks in jilin, northeastern china. | severe fever with thrombocytopenia syndrome (sfts) is an emerging tick-borne zoonosis. the aim of this study was to investigate sfts virus (sftsv) infections in ticks in northeastern china. a total of 6427 ticks, including 5450 haemaphysalis longicornis, 463 dermacentor silvarum, 351 dermacentor nuttalli, and 163 ixodes persulcatus, were sampled in the liaoning, jilin, and heilongjiang provinces of northeastern china. viral megagenomic analysis of the ticks revealed 25 contigs targeting the m an ... | 2016 | 27460903 |
| influence of altitude on tick-borne encephalitis infection risk in the natural foci of the altai republic, southern siberia. | the altai republic is a highly endemic area as far as tick-borne encephalitis (tbe) is concerned. the aim of the research was to study the effect of altitude on the risk of tick-borne encephalitis infection in the altai republic. the paper analyzes the following data: the study of ixodid ticks collected from the vegetation in 116 sites at the 200-2383m elevation above sea level in 2012-2014, tbe virus prevalence of these vectors, tick-bite incidence rate, and tbe incidence rate of the population ... | 2015 | 25748512 |
| molecular identification and phylogeny of dermacentor nuttalli (acari: ixodidae). | dermacentor nuttalli is an epidemiologically important tick in palearctic asia which transmits several infectious diseases including tularemia, north asian tick-borne rickettsiosis, lyme disease and tick-borne encephalitis. the genetic specificity and phylogeny of d. nuttalli from four geographic localities in eastern siberia were characterized using the mitochondrial (mt) 16s ribosomal rna (rrna) gene and internal transcribed spacer 2 (its2). low genetic diversity was observed in the population ... | 2014 | 24604384 |
| molecular prevalence of spotted fever group rickettsiae in ticks from qinghai province, northwestern china. | tick-borne rickettsioses is one of the oldest known vector-borne diseases and has been viewed as emerging or re-emerging disease in china. the causative agents have been increasingly recognized and exhibited a high degree of genetic diversity and widespread distribution. this study was conducted to determine the prevalence of spotted fever group rickettsiae in ticks from qinghai province, northwestern china. in total, 860 questing adult ticks representing six species were collected. the sfg rick ... | 2018 | 29107656 |