Objective: To know some genetical characterizations of Coxiella burnetii Chinese isolates by comparing the coml gene sequence. Methods: com1 gene sequences of Chinese isolates were amplified, se-quenced, and analyzed ...Objective: To know some genetical characterizations of Coxiella burnetii Chinese isolates by comparing the coml gene sequence. Methods: com1 gene sequences of Chinese isolates were amplified, se-quenced, and analyzed by comparing our result and the previous published data. Results: Three different com1 sequences were identified in 7 Chinese isolates. Sequence comparison indicated that the isolates harboring the QpRS plasmid could be defined as a new group and, in addition, the isolates carrying the same plas-mid type showed similar com1 gene sequence. Conclusion: Study suggests that the classification of the group based on the coml gene sequence is highly associated with the plasmid type of the isolates and, however, little related to disease forms and geographical origins of the isolates.展开更多
Objective:To detect Coxiella burnetii(C.burnetii)DNA in clinical specimens from camel,goats,cattle and sheep in the Kingdom of Saudi Arabia.Methods:A total of 367 clinical samples including blood,milk,faeces and urine...Objective:To detect Coxiella burnetii(C.burnetii)DNA in clinical specimens from camel,goats,cattle and sheep in the Kingdom of Saudi Arabia.Methods:A total of 367 clinical samples including blood,milk,faeces and urine were collected from different livestock and subjected to PCR amplification using primers which amplify transposon-like region and transposase gene.Results:Positive amplification from both regions was obtained from camel,goats and cattle but not from sheep.A percentage of 10.8%samples yielded positive PCR amplification from both blood and milk,where 15 of 139 blood and 16 of 148 milk samples were positive.Faeces and urine showed higher percentages of positive samples reaching 40.8%and 23.8%respectively.Conclusions:The preferred route of shedding in camel appeared to be the faeces followed by urine,while that of goats appeared to be the faeces and that of the cattle appeared to be the milk.展开更多
Objective:To determine the prevalence of Coxiella burnetii(C.burnetii) antibody positive randomly selected dairy herds in southeast Iran(Kerman).Methods:Bulk tank milk samples were collected randomly from 44 sufficien...Objective:To determine the prevalence of Coxiella burnetii(C.burnetii) antibody positive randomly selected dairy herds in southeast Iran(Kerman).Methods:Bulk tank milk samples were collected randomly from 44 sufficiently large commercial dairy herds,included near 12 000 dairy cattle,in Kerman(The largest province of Iran),southeast Iran.The samples were tested for antibodies against C.burnetii using the commercial CHEKIT(?) Q fever antibody ELISA Test Kit(Idexx,Liebefeld-Bern,Switzerland).Results:The prevalence of positive,negative and intermediate herds were 45.4%,43.2%and 11.4%,respectively.Conclusions:The result supports the hypothesis of high prevalence and endemic pattern of Q fever in Iran.This investigation highlights the importance of further studies on Q fever in Iran.展开更多
Although Coxiella burnetii is considered to be an obligate intracellular bacterium and grows in embryonated eggs, laboratory animals and cell culture, recently it has been grown in cell-free media and on agar plates. ...Although Coxiella burnetii is considered to be an obligate intracellular bacterium and grows in embryonated eggs, laboratory animals and cell culture, recently it has been grown in cell-free media and on agar plates. This current study was conducted to compare four cell lines for their yield of C. burnetii. Four different isolates of C. burnetii (Henzerling, Arandale, Cumberland and Timony) were grown in DH82, L929, Vero and XTC-2 cell lines. The DH82 and XTC-2 cells lines produced the highest C. burnetii yield which was slightly less than the yields achieved in recently published studies using cell free media. The Arandale isolate of C. burnetii produced a significantly higher yield in DH82 cells compared to XTC-2 cells (P 0.03).展开更多
Coxiella burnetii is the etiological agent of Q fever.To identify its major seroreactive proteins,a subgenomic protein array was developed.A total of 101 assumed virulence-associated recombinant proteins of C.burnetii...Coxiella burnetii is the etiological agent of Q fever.To identify its major seroreactive proteins,a subgenomic protein array was developed.A total of 101 assumed virulence-associated recombinant proteins of C.burnetii were probed with sera from mice experimentally infected with C.burnetii and sera from Q fever patients.Sixteen proteins were recognized as major seroreactive antigens by the mouse sera.Seven of these 16 proteins reacted positively with at least 45% of Q fever patient sera.Notably,HspB had the highest fluorescence intensity value and positive frequency of all the proteins on the array when probed with both Q fever patient sera and mouse sera.These results suggest that these seven major seroreactive proteins,particularly HspB,are potential serodiagnostic and subunit vaccine antigens of Q fever.展开更多
Objective:To detect the prevalence of Coxiella burnetii(C.burnetii)in two species of snails consisted of Lymnaea palustris(L.palustris)and Pomacea canaliculata(P.canaliculata)by using nested PCR method in Chaharmahel ...Objective:To detect the prevalence of Coxiella burnetii(C.burnetii)in two species of snails consisted of Lymnaea palustris(L.palustris)and Pomacea canaliculata(P.canaliculata)by using nested PCR method in Chaharmahel Va Bakhtiari Province which is located in the southwest of Iran.Methods:A total of 160 snail samples consisted of 100 L.palustris and 60 P.canaliculata were collected from 4 rice paddy fields in the southwest of Iran between June and August 2014.Snails'DNA was extracted by a genomic DNA purification kit according to the manufacturer's instructions.Detection of the presence of C.burnetii's DNA was carried out by using a nested PCR assay with[specific primers outer membrane protein 1(OMP1)-OMP2 and OMP3-OMP4]targeting the com1 gene.Results:In this study,a total of 160 snail samples were tested and 15(9.37%)samples were found positive for C.burnetii,15 samples were positive from the L.palustris and there were no positive samples from P.canaliculata.Conclusions:Snails are kind of gastropods which seem to be harmless in life,but these small gastropods can be very dangerous for farmers,especially in humid climates.Also,C.burnetii in snails showed that this bacterium can be a factor of transmission of contamination to human beings and animals.展开更多
为了建立同步检测奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体感染的多重PCR方法,根据GenBank上具有属间特异性的布鲁菌.Bp26基因、鹦鹉热衣原体23S rRNA基因和贝纳氏柯克斯氏体IS1111a基因,利用Primer premier 5.0软件各设计1对特异...为了建立同步检测奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体感染的多重PCR方法,根据GenBank上具有属间特异性的布鲁菌.Bp26基因、鹦鹉热衣原体23S rRNA基因和贝纳氏柯克斯氏体IS1111a基因,利用Primer premier 5.0软件各设计1对特异性引物。通过优化PCR反应体系和扩增条件,建立了能够同时检测奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体的多重PCR方法。该方法具有较好的特异性和可重复性,对3种基因单重PCR检测敏感性均达到3.1×10~2拷贝·反应^-1,对3种病原基因同步检测的敏感性能达到3.1×10~3拷贝·反应^-1。利用该方法对采自不同流产牛的抗凝全血、血清、流产胎儿及奶液等172份临床样品进行检测,检测到布鲁菌感染阳性样品53份,鹦鹉热衣原体感染阳性样品2份,贝纳氏柯克斯氏体感染阳性样品10份,且检测到布鲁菌和鹦鹉衣原体混合感染阳性样品2份,布鲁菌和贝纳氏柯克斯氏体混合感染阳性样品2份,尚未检测到3种病原混合感染的阳性样品。结果表明,建立的多重PCR方法可以用来对奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体进行同步、快速、灵敏的检测。展开更多
基金Supported by Science Research Grant from the Ministry of E-ducation, Science, Sports and Culture of Japan (No. 10460140 and 11556060), and by Health Sciences Research Grant on Emerging and Re-emerging Infectious Diseases from the Ministry of Health and W
文摘Objective: To know some genetical characterizations of Coxiella burnetii Chinese isolates by comparing the coml gene sequence. Methods: com1 gene sequences of Chinese isolates were amplified, se-quenced, and analyzed by comparing our result and the previous published data. Results: Three different com1 sequences were identified in 7 Chinese isolates. Sequence comparison indicated that the isolates harboring the QpRS plasmid could be defined as a new group and, in addition, the isolates carrying the same plas-mid type showed similar com1 gene sequence. Conclusion: Study suggests that the classification of the group based on the coml gene sequence is highly associated with the plasmid type of the isolates and, however, little related to disease forms and geographical origins of the isolates.
基金supported by research grant(No.AT-30-296) from king Ahdulaziz city
文摘Objective:To detect Coxiella burnetii(C.burnetii)DNA in clinical specimens from camel,goats,cattle and sheep in the Kingdom of Saudi Arabia.Methods:A total of 367 clinical samples including blood,milk,faeces and urine were collected from different livestock and subjected to PCR amplification using primers which amplify transposon-like region and transposase gene.Results:Positive amplification from both regions was obtained from camel,goats and cattle but not from sheep.A percentage of 10.8%samples yielded positive PCR amplification from both blood and milk,where 15 of 139 blood and 16 of 148 milk samples were positive.Faeces and urine showed higher percentages of positive samples reaching 40.8%and 23.8%respectively.Conclusions:The preferred route of shedding in camel appeared to be the faeces followed by urine,while that of goats appeared to be the faeces and that of the cattle appeared to be the milk.
基金financially supported by Research Center for Tropical and Infectious Diseases,Kerman University of Medical Sciences,Kerman,Iran and Shahid Bahonar University of Kerman,Iran
文摘Objective:To determine the prevalence of Coxiella burnetii(C.burnetii) antibody positive randomly selected dairy herds in southeast Iran(Kerman).Methods:Bulk tank milk samples were collected randomly from 44 sufficiently large commercial dairy herds,included near 12 000 dairy cattle,in Kerman(The largest province of Iran),southeast Iran.The samples were tested for antibodies against C.burnetii using the commercial CHEKIT(?) Q fever antibody ELISA Test Kit(Idexx,Liebefeld-Bern,Switzerland).Results:The prevalence of positive,negative and intermediate herds were 45.4%,43.2%and 11.4%,respectively.Conclusions:The result supports the hypothesis of high prevalence and endemic pattern of Q fever in Iran.This investigation highlights the importance of further studies on Q fever in Iran.
文摘Although Coxiella burnetii is considered to be an obligate intracellular bacterium and grows in embryonated eggs, laboratory animals and cell culture, recently it has been grown in cell-free media and on agar plates. This current study was conducted to compare four cell lines for their yield of C. burnetii. Four different isolates of C. burnetii (Henzerling, Arandale, Cumberland and Timony) were grown in DH82, L929, Vero and XTC-2 cell lines. The DH82 and XTC-2 cells lines produced the highest C. burnetii yield which was slightly less than the yields achieved in recently published studies using cell free media. The Arandale isolate of C. burnetii produced a significantly higher yield in DH82 cells compared to XTC-2 cells (P 0.03).
基金supported by the National Natural Science Foundation of China(31170161)National Basic Research Program of China(2010CB530200,2010CB530205)
文摘Coxiella burnetii is the etiological agent of Q fever.To identify its major seroreactive proteins,a subgenomic protein array was developed.A total of 101 assumed virulence-associated recombinant proteins of C.burnetii were probed with sera from mice experimentally infected with C.burnetii and sera from Q fever patients.Sixteen proteins were recognized as major seroreactive antigens by the mouse sera.Seven of these 16 proteins reacted positively with at least 45% of Q fever patient sera.Notably,HspB had the highest fluorescence intensity value and positive frequency of all the proteins on the array when probed with both Q fever patient sera and mouse sera.These results suggest that these seven major seroreactive proteins,particularly HspB,are potential serodiagnostic and subunit vaccine antigens of Q fever.
基金Supported by Islamic Azad University,Shahrekord Branch,Shahrekord,Iran,(Grant No.17621105).
文摘Objective:To detect the prevalence of Coxiella burnetii(C.burnetii)in two species of snails consisted of Lymnaea palustris(L.palustris)and Pomacea canaliculata(P.canaliculata)by using nested PCR method in Chaharmahel Va Bakhtiari Province which is located in the southwest of Iran.Methods:A total of 160 snail samples consisted of 100 L.palustris and 60 P.canaliculata were collected from 4 rice paddy fields in the southwest of Iran between June and August 2014.Snails'DNA was extracted by a genomic DNA purification kit according to the manufacturer's instructions.Detection of the presence of C.burnetii's DNA was carried out by using a nested PCR assay with[specific primers outer membrane protein 1(OMP1)-OMP2 and OMP3-OMP4]targeting the com1 gene.Results:In this study,a total of 160 snail samples were tested and 15(9.37%)samples were found positive for C.burnetii,15 samples were positive from the L.palustris and there were no positive samples from P.canaliculata.Conclusions:Snails are kind of gastropods which seem to be harmless in life,but these small gastropods can be very dangerous for farmers,especially in humid climates.Also,C.burnetii in snails showed that this bacterium can be a factor of transmission of contamination to human beings and animals.
文摘为了建立同步检测奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体感染的多重PCR方法,根据GenBank上具有属间特异性的布鲁菌.Bp26基因、鹦鹉热衣原体23S rRNA基因和贝纳氏柯克斯氏体IS1111a基因,利用Primer premier 5.0软件各设计1对特异性引物。通过优化PCR反应体系和扩增条件,建立了能够同时检测奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体的多重PCR方法。该方法具有较好的特异性和可重复性,对3种基因单重PCR检测敏感性均达到3.1×10~2拷贝·反应^-1,对3种病原基因同步检测的敏感性能达到3.1×10~3拷贝·反应^-1。利用该方法对采自不同流产牛的抗凝全血、血清、流产胎儿及奶液等172份临床样品进行检测,检测到布鲁菌感染阳性样品53份,鹦鹉热衣原体感染阳性样品2份,贝纳氏柯克斯氏体感染阳性样品10份,且检测到布鲁菌和鹦鹉衣原体混合感染阳性样品2份,布鲁菌和贝纳氏柯克斯氏体混合感染阳性样品2份,尚未检测到3种病原混合感染的阳性样品。结果表明,建立的多重PCR方法可以用来对奶牛布鲁菌、鹦鹉热衣原体和贝纳氏柯克斯氏体进行同步、快速、灵敏的检测。
