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<p><b>OBJECTIVE</b>To study the genotype distributions and epidemiological characteristics of Yersinia pestis in Gansu province.</p><p><b>METHODS</b>Primers were designed according to the confirmed 23 differential sections, to genotype the 202 Yersinia pestis DNA of Gansu province by PCR, and to analyze its distribution and epidemiological characteristics.</p><p><b>RESULTS</b>Yersinia pestis in Gansu province could be divided into eight genotypes: 1b, 5, 7, 8, 13, 26, new genotype 1 (GS1) and new genotype 2 (GS2). They were distributed in various regions. 1b, 8 and GS1 genotypes of Yersinia pestis had been identified since 1960s but the 7, 13 and 26 genotypes had not been isolated for more than 40 years while GS2 and 5 genotypes had been isolated since 1990s.</p><p><b>CONCLUSION</b>1b, 8 and GS1 genotypes of Yersinia pestis continued to be violently prevalent since 1960s but 7, 13 and 26 genotypes had not been isolated for more than 40 years while GS2 and 5 genotypes had started to be popular since 1990s.</p>
Asunto(s)
Animales , Humanos , China , Epidemiología , Cartilla de ADN , Variación Genética , Genoma Bacteriano , Genotipo , Peste , Epidemiología , Microbiología , Yersinia pestis , GenéticaRESUMEN
Objective To study the single nucleotide polymorphisms (SNP) characteristics of Yersinia pestis strains from different natural foci in China.Methods Genome-wide comparison was done to find SNP sites by the Mummer program among 9 Yersinia pestis genome which was downloaded from NCBI.Then 13 genic fragments including 19 SNP sites were amplified by PCR and sequenced in 133 Yersinia pestis strains,and the results were cluster analyzed with the BioNumerics software.Results Three thousand seven hundred and eighty sequence variation sites were found by genome-wide comparison.Using the different combinations of SNP sites,UPGMA cluster analysis revealed obvious geographic regional and eco-aggregation characteristics of Yersinia pestis strains isolated from China.Conclusions As relatively stable genetic markers,SNP can better reflect the genome characteristics of Yersinia pestis in different plague natural foci of China.
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Objective To evaluate the effect of up-converting phosphor technology(UPT) in detection of plague antigen-antibody by receiver operating characteristic curve (ROC) method,and to provide a scientific basis for field application of UPT rapid detection technology in plague prevention and control.Methods Two hundred and twenty four serum samples were collected from Marmots and ground squirrels in the plague foci,Yersinia pestis antibody was detected by UPT,ELISA,Colloidal-gold Strips and IHA,respectively; 108 organs and bone marrow samples were collected,and Yersinia pestis antigens were detected by UPT,ELISA,PCR and RIHA,respectively.IHA was used as the gold standard for antibody test results,RIHA,PCR + Colloidal-gold Strips,PCR + ELISA were used as the gold standard for antigen test results.The results were evaluated using ROC method.Results Antibodies detection:the AUCs of UPT,ELISA and Colloidal-gold Strips were greater than 0.5.The difference between UPT and other methods was not statistically significant (z =1.204,P > 0.05).Antigen detection:the AUCs of UPT,ELISA,Colloidal-gold Strips and PCR were greater than 0.5.There was no statistical difference between UPT and other methods(z =0.866,P > 0.05).Conclusions UPT as a new technology works well in the detection of plague antigen-antibody.The technology is simple,fast,accurate,and suitable for on-site monitoring of plague,emergency treatment of sudden plague,and suitable for promotion.