Cryptosporidiosis is an important zoonosis caused by the Cryptosporidium species. To develop a PCR diagnostic kit for molecular detection and differential diagnosis of Cryptosporidium spp., a portion of ITS-1 sequence...Cryptosporidiosis is an important zoonosis caused by the Cryptosporidium species. To develop a PCR diagnostic kit for molecular detection and differential diagnosis of Cryptosporidium spp., a portion of ITS-1 sequence of Cryptosporidium. andersoni was chosen as the target DNA for designing the species-specific primers （ZRQF/ZR）. The kit components were determined after the PCR amplification conditions were serially optimized. A series of tests were conducted in the specificity, sensitivity, stability, reproducibility, and stored period of the kit, respectively. The results showed that only C. andersoni were amplified specific band of about 500 bp, while Cryptosporidium. parvum, Cryptosporidium. baileyi, Eimeria sp of dairy cow, Toxoplasma gondii, Eimeria sp of pig, Ascaris suum, Cyclospora sp, and E. coli could not be amplified. 254 oocysts of C. andersoni was the lowest number that could be detected using the kit. The kit worked well after being stored at room temperature, 4 and -20℃ for nine months. Fecal specimens, which were collected from a total of 243 calves on four different dairy farms in Guangdong Province, China, and one dairy farm in Henan Province, China, were examined using the kit; the positive rate of the kit was 2-13% higher than that of the routine methods. The results indicated that the kit can detect fecal samples faster, more sensitively, and conveniently, and can provide a useful tool for the identification and differentiation of C. andersoni from the other Cryptosporidium species; it also has implications for further studies on molecular epidemiology and differential diagnostics of cryptosporidiosis in animals.展开更多
目的探讨一种基于试剂盒内自带质控品条件下的稳定有效的质控管理措施。方法选取中国人民解放军联勤保障部队第九〇七医院检验科2022年11月2日—2023年7月22日室内质控数据进行分析。更换试剂批次时试剂盒内质控品批次也同时更换,观察...目的探讨一种基于试剂盒内自带质控品条件下的稳定有效的质控管理措施。方法选取中国人民解放军联勤保障部队第九〇七医院检验科2022年11月2日—2023年7月22日室内质控数据进行分析。更换试剂批次时试剂盒内质控品批次也同时更换,观察试剂盒内自带质控品和第三方质控品室内质控Levey-Jennings图变化,评估各批次允许不精密度[以变异系数(coefficient of variation,CV)表示]。采用固定试剂盒内自带质控品批次,更换试剂批次时试剂自带质控品批次不更换,观察试剂盒内自带质控品和第三方质控品Levey-Jennings图变化,评估各批次和累积允许不精密度(以CV表示),比较σ值差异。结果同时更换试剂及自带质控品共3个批次,虽然自带质控品和第三方质控品各批次CV均符合实验室质量控制目标CV≤10%。但是每次更换批号,第三方质控Levey-Jennings图出现明显批间差,用试剂自带质控品Levey-Jennings图则批内稳定,无法提示试剂批间差。采用固定试剂盒内自带质控品批次,更换试剂批次时试剂盒内自带质控品批次不更换的情况下,更换3个批次试剂,试剂盒内自带质控品和第三方质控品一样每次更换试剂批次Levey-Jennings图都出现较大差异,且自带质控品和第三方质控品各批次和累积CV均符合实验室质量控制目标CV≤10%,σ值均达到世界一流水平。试剂盒内自带质控品也可以反映试剂批间差,与第三方质控品达到一样的效果。结论通过改进试剂盒内自带质控品的使用管理措施,可以优化质控效率,降低临床安全隐患。展开更多
A cDNA fragment of about 860 bp corresponding to the c33-c gene in the non-structural region 3 (NS3) of HCV genome was obtained from one plasma derived from a Chinese HCV carrier who came from Tai'an of Shandong P...A cDNA fragment of about 860 bp corresponding to the c33-c gene in the non-structural region 3 (NS3) of HCV genome was obtained from one plasma derived from a Chinese HCV carrier who came from Tai'an of Shandong Province, China by the application of reverse transcription (RT) and polymerase chain reaction (PCR) techniques. After the sequence of the cDNA fragment was determined and compared with the equivalent region of. the HCV-I (HCV-US) and HCV-II (HCV-BK) genomes, the nucleotide/ amino acid sequence homologies were found to be 79. 2%/91. 3% and 91. 3%/93. 9%, respectively. The prokaryotic expression vector pBV220 was employed for the overproduction of c33-c native recombinant protein in E. coli cells. The expression products were detected by enzyme-linked immunosorbent assay (ELISA) and Western blotting with antisera of chronic hepatitis C patients, and a molecular weight 31 kD of c33-c viral protein was shown to account for 14% of the total cellular soluble proteins. This product was extracted from the bacterial lysate by lysozyme, Triton X-100 and urea treatment, and purified through ion exchange chromatography. The purified c33-c protein combined with a branch peptide MAP-C-19 representing immunodominant epitopes on the nucleocapsid region of HCV genome was used to develop a Chinese HCV EIA 2nd-generation diagnostic kit for the detection of anti-HCV antibodies. Its specifity, sensitivity and re-producibility were all in keeping with the indexes of the national standard for the quality control of the HCV diagnostic kit. The agreement rate between our kit and Abbott company's HCV EIA second-generation diagnostic kit was 99. 33% , and the identified rate of positive anti-HCV of our kit was 2% more than that of the Abbott company's kit.展开更多
[Objectives]To fully understand the quality of commercial enzyme inhibition-colorimetric pesticide residue rapid detection kits,so that they can play a greater role in the detection and supervision of agricultural pro...[Objectives]To fully understand the quality of commercial enzyme inhibition-colorimetric pesticide residue rapid detection kits,so that they can play a greater role in the detection and supervision of agricultural products.[Methods]The sensitivity of 28 kinds of pesticides was determined by using the commercially available enzyme inhibition colorimetric rapid detection kit with Hendu brand.[Results]There was a significant difference in the sensitivity of the kit to each pesticide,and the kit was more sensitive to dichlorvos among the 28 pesticides tested.The sensitivity to methyl isosalifos,dimethoate,isocarbophos,fenthion and phorate was poor,and the sensitivity to quinalphos was different between 3.0 and 2.5 mL.[Conclusions]The large difference of the sensitivity of the enzyme inhibition-colorimetric rapid detection kit for pesticide residues to different kits is a reason for the false positive and false negative test results of the kit,which needs to be considered by relevant personnel.展开更多
文摘Cryptosporidiosis is an important zoonosis caused by the Cryptosporidium species. To develop a PCR diagnostic kit for molecular detection and differential diagnosis of Cryptosporidium spp., a portion of ITS-1 sequence of Cryptosporidium. andersoni was chosen as the target DNA for designing the species-specific primers （ZRQF/ZR）. The kit components were determined after the PCR amplification conditions were serially optimized. A series of tests were conducted in the specificity, sensitivity, stability, reproducibility, and stored period of the kit, respectively. The results showed that only C. andersoni were amplified specific band of about 500 bp, while Cryptosporidium. parvum, Cryptosporidium. baileyi, Eimeria sp of dairy cow, Toxoplasma gondii, Eimeria sp of pig, Ascaris suum, Cyclospora sp, and E. coli could not be amplified. 254 oocysts of C. andersoni was the lowest number that could be detected using the kit. The kit worked well after being stored at room temperature, 4 and -20℃ for nine months. Fecal specimens, which were collected from a total of 243 calves on four different dairy farms in Guangdong Province, China, and one dairy farm in Henan Province, China, were examined using the kit; the positive rate of the kit was 2-13% higher than that of the routine methods. The results indicated that the kit can detect fecal samples faster, more sensitively, and conveniently, and can provide a useful tool for the identification and differentiation of C. andersoni from the other Cryptosporidium species; it also has implications for further studies on molecular epidemiology and differential diagnostics of cryptosporidiosis in animals.
文摘目的探讨一种基于试剂盒内自带质控品条件下的稳定有效的质控管理措施。方法选取中国人民解放军联勤保障部队第九〇七医院检验科2022年11月2日—2023年7月22日室内质控数据进行分析。更换试剂批次时试剂盒内质控品批次也同时更换,观察试剂盒内自带质控品和第三方质控品室内质控Levey-Jennings图变化,评估各批次允许不精密度[以变异系数(coefficient of variation,CV)表示]。采用固定试剂盒内自带质控品批次,更换试剂批次时试剂自带质控品批次不更换,观察试剂盒内自带质控品和第三方质控品Levey-Jennings图变化,评估各批次和累积允许不精密度(以CV表示),比较σ值差异。结果同时更换试剂及自带质控品共3个批次,虽然自带质控品和第三方质控品各批次CV均符合实验室质量控制目标CV≤10%。但是每次更换批号,第三方质控Levey-Jennings图出现明显批间差,用试剂自带质控品Levey-Jennings图则批内稳定,无法提示试剂批间差。采用固定试剂盒内自带质控品批次,更换试剂批次时试剂盒内自带质控品批次不更换的情况下,更换3个批次试剂,试剂盒内自带质控品和第三方质控品一样每次更换试剂批次Levey-Jennings图都出现较大差异,且自带质控品和第三方质控品各批次和累积CV均符合实验室质量控制目标CV≤10%,σ值均达到世界一流水平。试剂盒内自带质控品也可以反映试剂批间差,与第三方质控品达到一样的效果。结论通过改进试剂盒内自带质控品的使用管理措施,可以优化质控效率,降低临床安全隐患。
文摘A cDNA fragment of about 860 bp corresponding to the c33-c gene in the non-structural region 3 (NS3) of HCV genome was obtained from one plasma derived from a Chinese HCV carrier who came from Tai'an of Shandong Province, China by the application of reverse transcription (RT) and polymerase chain reaction (PCR) techniques. After the sequence of the cDNA fragment was determined and compared with the equivalent region of. the HCV-I (HCV-US) and HCV-II (HCV-BK) genomes, the nucleotide/ amino acid sequence homologies were found to be 79. 2%/91. 3% and 91. 3%/93. 9%, respectively. The prokaryotic expression vector pBV220 was employed for the overproduction of c33-c native recombinant protein in E. coli cells. The expression products were detected by enzyme-linked immunosorbent assay (ELISA) and Western blotting with antisera of chronic hepatitis C patients, and a molecular weight 31 kD of c33-c viral protein was shown to account for 14% of the total cellular soluble proteins. This product was extracted from the bacterial lysate by lysozyme, Triton X-100 and urea treatment, and purified through ion exchange chromatography. The purified c33-c protein combined with a branch peptide MAP-C-19 representing immunodominant epitopes on the nucleocapsid region of HCV genome was used to develop a Chinese HCV EIA 2nd-generation diagnostic kit for the detection of anti-HCV antibodies. Its specifity, sensitivity and re-producibility were all in keeping with the indexes of the national standard for the quality control of the HCV diagnostic kit. The agreement rate between our kit and Abbott company's HCV EIA second-generation diagnostic kit was 99. 33% , and the identified rate of positive anti-HCV of our kit was 2% more than that of the Abbott company's kit.
文摘[Objectives]To fully understand the quality of commercial enzyme inhibition-colorimetric pesticide residue rapid detection kits,so that they can play a greater role in the detection and supervision of agricultural products.[Methods]The sensitivity of 28 kinds of pesticides was determined by using the commercially available enzyme inhibition colorimetric rapid detection kit with Hendu brand.[Results]There was a significant difference in the sensitivity of the kit to each pesticide,and the kit was more sensitive to dichlorvos among the 28 pesticides tested.The sensitivity to methyl isosalifos,dimethoate,isocarbophos,fenthion and phorate was poor,and the sensitivity to quinalphos was different between 3.0 and 2.5 mL.[Conclusions]The large difference of the sensitivity of the enzyme inhibition-colorimetric rapid detection kit for pesticide residues to different kits is a reason for the false positive and false negative test results of the kit,which needs to be considered by relevant personnel.
