To develop a national reference panel for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)antigen detection kit and establish a quality standard.The cultures of SARS-CoV-2 and other pathogens were collected...To develop a national reference panel for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)antigen detection kit and establish a quality standard.The cultures of SARS-CoV-2 and other pathogens were collected to establish a national reference panel for SARS-CoV-2 antigen detection.The stability and homogeneity of the reference panel were evaluated.Based on World Health Organization(WHO)guidance and nucleic acid quantitative results,a quality standard reference panel was established.Currently,three generations of SARS-CoV-2 antigen national reference materials with batch numbers 370095–202001,370095–202202,and 370095–202203 have been successfully established.These national reference panels comprised 8 positive samples,20 negative samples,1 repetitive sample,and 1 lower detection limit sample.The stability and homogeneity of the reference panel meet the requirements.The quality standards are as follows:the positive and negative coincidence rates are 8/8 and 20/20,respectively.The 10 test results of the medium and low-concentration repetitive reference materials should be positive,and the color rendering should be uniform(or the coefficient of variance should not be higher than 20.0%).The lower detection limit should be at least 5×105 U/mL(equivalent to copies/mL),and higher concentrations above the lower detection limit must be positive.A national reference panel for the SARS-CoV-2 antigen detection kit has been established.As the standard of SARS-CoV-2 antigen reagents,the reference panel has played a crucial role in the pre-marketing quality evaluation and post-marketing quality supervision in China.展开更多
AIM To determine the distribution of rotavirus VP7 gene in hospitalized children in Yunnan, China. METHODS A total of 366 stool specimens were collected from hospitalized children in hospitals in Yunnan Province from ...AIM To determine the distribution of rotavirus VP7 gene in hospitalized children in Yunnan, China. METHODS A total of 366 stool specimens were collected from hospitalized children in hospitals in Yunnan Province from September 2010 to December 2013. The genomic RNA electropherotypes and the G genotypes of the rotaviruses were determined. A phylogenetic analysis of the VP7 gene was performed. Rotavirus isolation was performed, and characterized by plaque, minimum essential medium, and all genes sequence analysis. Quantification of antibodies for inactivated vaccine prepared with ZTR-68 was examined by enzyme-linked immunosorbent assay and microneutralization assay.RESULTS Group A human rotavirus was detected in 177 of 366(48.4%) stool samples using a colloidal gold device assay. The temporal distribution of rotavirus cases showed significant correlation with the mean air temperature. Rotaviruses were isolated from 13% of the rotavirus-positive samples. The predominant genotype was G1(43.5%), followed by G3(21.7%), G9(17.4%), G2(4.3%), G4(8.7%), and mixed(4.3%) among a total of 23 rotavirus isolates. A rotavirus strain was isolated from a rotavirus-positive stool sample of a 4-month-old child in The First People's Hospital of Zhaotong(2010) for use as a candidate human inactivated rotavirus vaccine strain and for further research, and was designated ZTR-68. The genotype of 11 gene segments of strain ZTR-68(RVA/Human-wt/CHN/ZTR-68/2010/G1P[8]) was characterized. The genotype constellation of strain ZTR-68 was identified as G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E1-H1. The VP7 and VP4 genotypes of strain ZTR-68 were similar to Wa-like strains.CONCLUSIONS A high prevalence of the G1, G2, and G3 genotypes was detected from 2010 to 2012. However, a dominant prevalence of the G9 genotype was identified as the cause of gastroenteritis in children in Yunnan, China, in 2013. A candidate human inactivated rotavirus vaccine strain, designated ZTR-68 was isolated, characterized, and showed immunogenicity. Our data will be useful for the future formulation and development of a vaccine in China.展开更多
目的建立A群链球菌抗原检测试剂盒(胶体金法)质控参考品,并进行初步检测。方法从国家医学细菌保藏管理中心库存标准菌株中筛选出10株A群链球菌和10株非A群链球菌进行菌落形态、菌型、生物学特性及16s r RNA鉴定;并确定菌液浓度测定方法...目的建立A群链球菌抗原检测试剂盒(胶体金法)质控参考品,并进行初步检测。方法从国家医学细菌保藏管理中心库存标准菌株中筛选出10株A群链球菌和10株非A群链球菌进行菌落形态、菌型、生物学特性及16s r RNA鉴定;并确定菌液浓度测定方法。结果选择了10株不同来源的A群链球菌作为阳性参考菌株,10株同属不同群或寄生部位与A群链球菌相同的其他种属菌株作为阴性参考菌株。经16s r RNA基因序列比对,所选参比菌株与相应的模式株相似度均在99%以上。平板计数结果明显低于显微计数法,不同人员分别对32份菌液进行显微计数的结果差异无统计学意义(P=0.310)。结论建立了A群链球菌抗原检测试剂盒(胶体金法)质控参考菌株,并确立了显微计数法作为确定参考菌液浓度的方法,为今后相关参考品的制备奠定了基础。展开更多
基金supported by the National Key Research and Development Program of China (2021YFC2400904)the National Science and Technology Major Project of China (2018ZX10102001).
文摘To develop a national reference panel for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)antigen detection kit and establish a quality standard.The cultures of SARS-CoV-2 and other pathogens were collected to establish a national reference panel for SARS-CoV-2 antigen detection.The stability and homogeneity of the reference panel were evaluated.Based on World Health Organization(WHO)guidance and nucleic acid quantitative results,a quality standard reference panel was established.Currently,three generations of SARS-CoV-2 antigen national reference materials with batch numbers 370095–202001,370095–202202,and 370095–202203 have been successfully established.These national reference panels comprised 8 positive samples,20 negative samples,1 repetitive sample,and 1 lower detection limit sample.The stability and homogeneity of the reference panel meet the requirements.The quality standards are as follows:the positive and negative coincidence rates are 8/8 and 20/20,respectively.The 10 test results of the medium and low-concentration repetitive reference materials should be positive,and the color rendering should be uniform(or the coefficient of variance should not be higher than 20.0%).The lower detection limit should be at least 5×105 U/mL(equivalent to copies/mL),and higher concentrations above the lower detection limit must be positive.A national reference panel for the SARS-CoV-2 antigen detection kit has been established.As the standard of SARS-CoV-2 antigen reagents,the reference panel has played a crucial role in the pre-marketing quality evaluation and post-marketing quality supervision in China.
基金Supported by the CAMS Initiative for Innovative Medicine,No.2016-I2M-1-019 and No.2016-I2M-3-026National Natural Science Foundation of China,No.31700154+2 种基金Major Science and Technology Special Project of Yunnan Province(Biomedicine),No.2018ZF006Science and Technology Project of Yunnan Province-general program,No.2016FB034The State Project for Essential Drug Research and Development,the national "Twelfth Five-Year" plan,No.2014ZX09102041004
文摘AIM To determine the distribution of rotavirus VP7 gene in hospitalized children in Yunnan, China. METHODS A total of 366 stool specimens were collected from hospitalized children in hospitals in Yunnan Province from September 2010 to December 2013. The genomic RNA electropherotypes and the G genotypes of the rotaviruses were determined. A phylogenetic analysis of the VP7 gene was performed. Rotavirus isolation was performed, and characterized by plaque, minimum essential medium, and all genes sequence analysis. Quantification of antibodies for inactivated vaccine prepared with ZTR-68 was examined by enzyme-linked immunosorbent assay and microneutralization assay.RESULTS Group A human rotavirus was detected in 177 of 366(48.4%) stool samples using a colloidal gold device assay. The temporal distribution of rotavirus cases showed significant correlation with the mean air temperature. Rotaviruses were isolated from 13% of the rotavirus-positive samples. The predominant genotype was G1(43.5%), followed by G3(21.7%), G9(17.4%), G2(4.3%), G4(8.7%), and mixed(4.3%) among a total of 23 rotavirus isolates. A rotavirus strain was isolated from a rotavirus-positive stool sample of a 4-month-old child in The First People's Hospital of Zhaotong(2010) for use as a candidate human inactivated rotavirus vaccine strain and for further research, and was designated ZTR-68. The genotype of 11 gene segments of strain ZTR-68(RVA/Human-wt/CHN/ZTR-68/2010/G1P[8]) was characterized. The genotype constellation of strain ZTR-68 was identified as G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E1-H1. The VP7 and VP4 genotypes of strain ZTR-68 were similar to Wa-like strains.CONCLUSIONS A high prevalence of the G1, G2, and G3 genotypes was detected from 2010 to 2012. However, a dominant prevalence of the G9 genotype was identified as the cause of gastroenteritis in children in Yunnan, China, in 2013. A candidate human inactivated rotavirus vaccine strain, designated ZTR-68 was isolated, characterized, and showed immunogenicity. Our data will be useful for the future formulation and development of a vaccine in China.
文摘目的建立A群链球菌抗原检测试剂盒(胶体金法)质控参考品,并进行初步检测。方法从国家医学细菌保藏管理中心库存标准菌株中筛选出10株A群链球菌和10株非A群链球菌进行菌落形态、菌型、生物学特性及16s r RNA鉴定;并确定菌液浓度测定方法。结果选择了10株不同来源的A群链球菌作为阳性参考菌株,10株同属不同群或寄生部位与A群链球菌相同的其他种属菌株作为阴性参考菌株。经16s r RNA基因序列比对,所选参比菌株与相应的模式株相似度均在99%以上。平板计数结果明显低于显微计数法,不同人员分别对32份菌液进行显微计数的结果差异无统计学意义(P=0.310)。结论建立了A群链球菌抗原检测试剂盒(胶体金法)质控参考菌株,并确立了显微计数法作为确定参考菌液浓度的方法,为今后相关参考品的制备奠定了基础。
