The paper aimed to establish a duplex PCR method for simultaneous detection of Pseudomonas savastanoi pv. Phaseolicola （Psp） and Curtobaeterium /accumfadens pv. Flaccumfaciens （Cff）. Based on the argK gene of Psp ...The paper aimed to establish a duplex PCR method for simultaneous detection of Pseudomonas savastanoi pv. Phaseolicola （Psp） and Curtobaeterium /accumfadens pv. Flaccumfaciens （Cff）. Based on the argK gene of Psp in GenBank, the primers PSPF1/PSPR2 were designed. The duplex PCR assay was dereloped using the combined primers PSPF1/PSPR2 and CflF1/CffR2, which were specific primers for Cff. The reaction conditions were optimized and specificity md sensitivity of the duplex PCR were tested. The expected DNA fragment was specifically amplified from the genomic DNA of Psp and Cff. Specificity was conirmed in the artificially inoculated soybean samples imparted. Thus, the duplex PCR developed in this study could be used for the simultaneous detection of Psp md Cff from imported soybean.展开更多
Objective:To design a duplex PCR for rapid and simultaneous detection of Brucella species, in human blood samples.Methods:Fifty-two peripheral bloods samples were collected from suspicious patients with brucellosis.Fo...Objective:To design a duplex PCR for rapid and simultaneous detection of Brucella species, in human blood samples.Methods:Fifty-two peripheral bloods samples were collected from suspicious patients with brucellosis.Following DNA extraction,PCR assay were performed, using three primers that could simultaneously identify and differentiate three major species of pathogenic Brucella in humans and animals.Results:Of the 52 peripheral bloods samples tested, 25 sample(48%) showed positive reactions in PCR.Twelve samples were positive for Brucella abortus(B.abortus)(23%,13 for Brucella melUensis(B.melUensis)(25%) and 0 for Brucella ovis (6.ovis)(Ow.Conclusions:This work de=monstrates dial in case where specific primers were utilized,duplex PCR has proved to be a simple,fast,and relatively inexpensive method for simultaneous detection of important species of Brucella in clinical samples.展开更多
Objective:To identify members of genera of rickettsia and O.tsutsugammhi simultaneously.Methods:Rapid and duplex and nested PCR methods have been established by designing primers based on the conserved regions of heat...Objective:To identify members of genera of rickettsia and O.tsutsugammhi simultaneously.Methods:Rapid and duplex and nested PCR methods have been established by designing primers based on the conserved regions of heat shock protein GroEL gene.345 mouse viscera samples including liver,spleen and kidney,96 Xenopsylla cheopis and 32 chiggers collected from Hongta areas of Yuxi city,Yunnan province were tested by the new PCR methods.Results:The result of the study showed that the new PCR methods could identify most members of genera -Rickettsia and Orientia simultaneously with 100%specificity and its sensitivity could test one copy per microliter.The results of detection prevalence of rickettsioses in mouse,flea and mites DNA samples showed that the total rickettsia infection rate in mouse was 34.78%(120/345).The total infection rates in R.typhi,O.t Karp and R.sibirica of mouse samples were 28.12%(97/345),19.71%(68/345) and O. 29%(1/345) respectively.Co-infection rates in R.typhi and 0.t Karp of mouse samples were 13.33%(46/ 345).O.t Karp type has been the main epidemic strain in these areas.Conclusion:We concluded that this PCR method could be used to detect multi-genera rickettsia simultaneously.Molecular evidences provided in this and previous studies strongly support that Hongta areas of Yuxi city are a natural focus for typhus and scrub typhus with the common occurrence of their confection.展开更多
H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg producti...H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg production. As similar symptoms are elicited by the two pathogens, it is difficult for their differential diagnosis. So far, no reverse transcription-polymerase chain reaction（RT-PCR） assay has been found to differentiate between H9 AIV and IBV in one reaction. Therefore, developing a sensitive and specific method is of importance to simultaneously detect and differentiate H9 AIV and IBV. In this study, a duplex RT-PCR（d RT-PCR） was established. Two primer sets target the hemagglutinin（HA） gene of H9 AIV and the nucleocapsid（N） gene of IBV, respectively. Spec ific PCR products were obtained from all tested H9 AIVs and IBVs belonging to the major clades circulating in China, but not from AIVs of other subtypes or other infectious avian viruses. The sensitivity of the d RT-PCR assay corresponding to H9 AIV, IBV and mixture of H9 AIV and IBV were at a concentration of 1×10^1, 1.5×10^1 and 1.5×10^1 50% egg infective doses（EID_（50）） m L^–1, respectively. The concordance rates between the d RT-PCR and virus isolation were 99.1 and 98.2%, respectively, for detection of samples from H9N2 AIV or IBV infected chickens, while the concordance rate was 99.1% for detection of samples from H9N2 AIV and IBV co-infected chickens. Thus, the d RT-PCR assay reported herein is specific and sensitive, and suitable for the differential diagnosis of clinical infections and survei llance of H9 AIVs and IBVs.展开更多
基金Supported by Science and Technology Project of AQSIQ(2013IK277)National Rice Industry System Development Program
文摘The paper aimed to establish a duplex PCR method for simultaneous detection of Pseudomonas savastanoi pv. Phaseolicola （Psp） and Curtobaeterium /accumfadens pv. Flaccumfaciens （Cff）. Based on the argK gene of Psp in GenBank, the primers PSPF1/PSPR2 were designed. The duplex PCR assay was dereloped using the combined primers PSPF1/PSPR2 and CflF1/CffR2, which were specific primers for Cff. The reaction conditions were optimized and specificity md sensitivity of the duplex PCR were tested. The expected DNA fragment was specifically amplified from the genomic DNA of Psp and Cff. Specificity was conirmed in the artificially inoculated soybean samples imparted. Thus, the duplex PCR developed in this study could be used for the simultaneous detection of Psp md Cff from imported soybean.
基金supported by Molecular Biology Research Center, Baqiyatallah University of Medical Sciences,with grant number BMSU/MBRC-90-001
文摘Objective:To design a duplex PCR for rapid and simultaneous detection of Brucella species, in human blood samples.Methods:Fifty-two peripheral bloods samples were collected from suspicious patients with brucellosis.Following DNA extraction,PCR assay were performed, using three primers that could simultaneously identify and differentiate three major species of pathogenic Brucella in humans and animals.Results:Of the 52 peripheral bloods samples tested, 25 sample(48%) showed positive reactions in PCR.Twelve samples were positive for Brucella abortus(B.abortus)(23%,13 for Brucella melUensis(B.melUensis)(25%) and 0 for Brucella ovis (6.ovis)(Ow.Conclusions:This work de=monstrates dial in case where specific primers were utilized,duplex PCR has proved to be a simple,fast,and relatively inexpensive method for simultaneous detection of important species of Brucella in clinical samples.
基金supported by National Natural Science Foundation of China(No. 30771854)China-U.S.Collaborative Program on Emerging and Re-emerging Infectious Diseases(No. 1U2GGH000018-01)
文摘Objective:To identify members of genera of rickettsia and O.tsutsugammhi simultaneously.Methods:Rapid and duplex and nested PCR methods have been established by designing primers based on the conserved regions of heat shock protein GroEL gene.345 mouse viscera samples including liver,spleen and kidney,96 Xenopsylla cheopis and 32 chiggers collected from Hongta areas of Yuxi city,Yunnan province were tested by the new PCR methods.Results:The result of the study showed that the new PCR methods could identify most members of genera -Rickettsia and Orientia simultaneously with 100%specificity and its sensitivity could test one copy per microliter.The results of detection prevalence of rickettsioses in mouse,flea and mites DNA samples showed that the total rickettsia infection rate in mouse was 34.78%(120/345).The total infection rates in R.typhi,O.t Karp and R.sibirica of mouse samples were 28.12%(97/345),19.71%(68/345) and O. 29%(1/345) respectively.Co-infection rates in R.typhi and 0.t Karp of mouse samples were 13.33%(46/ 345).O.t Karp type has been the main epidemic strain in these areas.Conclusion:We concluded that this PCR method could be used to detect multi-genera rickettsia simultaneously.Molecular evidences provided in this and previous studies strongly support that Hongta areas of Yuxi city are a natural focus for typhus and scrub typhus with the common occurrence of their confection.
基金supported by the National High-Tech R&D Program of China(2012AA101303)
文摘H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg production. As similar symptoms are elicited by the two pathogens, it is difficult for their differential diagnosis. So far, no reverse transcription-polymerase chain reaction（RT-PCR） assay has been found to differentiate between H9 AIV and IBV in one reaction. Therefore, developing a sensitive and specific method is of importance to simultaneously detect and differentiate H9 AIV and IBV. In this study, a duplex RT-PCR（d RT-PCR） was established. Two primer sets target the hemagglutinin（HA） gene of H9 AIV and the nucleocapsid（N） gene of IBV, respectively. Spec ific PCR products were obtained from all tested H9 AIVs and IBVs belonging to the major clades circulating in China, but not from AIVs of other subtypes or other infectious avian viruses. The sensitivity of the d RT-PCR assay corresponding to H9 AIV, IBV and mixture of H9 AIV and IBV were at a concentration of 1×10^1, 1.5×10^1 and 1.5×10^1 50% egg infective doses（EID_（50）） m L^–1, respectively. The concordance rates between the d RT-PCR and virus isolation were 99.1 and 98.2%, respectively, for detection of samples from H9N2 AIV or IBV infected chickens, while the concordance rate was 99.1% for detection of samples from H9N2 AIV and IBV co-infected chickens. Thus, the d RT-PCR assay reported herein is specific and sensitive, and suitable for the differential diagnosis of clinical infections and survei llance of H9 AIVs and IBVs.
