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Persistent efficacy of live attenuated hepatitis A vaccine (H2-strain) after a mass vaccination program 被引量:6
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作者 zhuang fang-cheng QIAN Wen +6 位作者 MAO Zi-an GONG Yue-ping JIANG Qi JIANG Li-min CHEN Nian-liang CHAI Shao-ai MAO Jiang-sen 《Chinese Medical Journal》 SCIE CAS CSCD 2005年第22期1851-1856,共6页
Background Live attenuated hepatitis A vaccine ( H2 strain) is widely applied in prevention of hepatitis A epidemic in China and other countries now. It is essential to observe and confirm the vaccine immune efficac... Background Live attenuated hepatitis A vaccine ( H2 strain) is widely applied in prevention of hepatitis A epidemic in China and other countries now. It is essential to observe and confirm the vaccine immune efficacy, population antibody level and its persistent efficacy after mass immunization. Methods A total of 220 children with negative anti-HAV antibody ( aged 1-3 years) were taken for follow-up assay to observe seroconversion and geometric mean titre(GMT) level 2 months, 12 months, 6 years, and 10 years after inoculation. Another survey sampled from subjects of different age groups (3, 6, 9, 15, 18, 25 and 35 years) to compare anti-HA antibody positive rate before and after inoculation performed 10 years previously. Epidemiological observations were taken for 10 years to evaluate the relationship between vaccine coverage and hepatitis A morbidity. Serum antibody to HAV was detected by enzyme linked immunoassay (ELISA, calibrated by WHO international reference) and ABBOTY Axsym HAVAB microparticle enzyme immunoassay. Results Seroconversion in follow-up assay 2 months and 10 years after inoculation was 98.6% and 80. 2% respectively. For children, the vaccination anti-HA antibody positive rates were significantly different before and after 10 years, 7.69% cf 70.45% (aged 3 years) and 52. 58% cf 71.78% (aged 18 years). When vaccine coverage rose from 57% to 74%, there were no any HA epidemics. When vaccine coverage reached 85%, there were no any HA cases. With vaccine coverage between 85% and 91%, there were no any HA cases in cohorts from the age of 1 year to 15 years during the 10 years. Conclusions Live attenuated hepatitis A vaccine has an obvious long-term effectiveness in prevention and control of HA epidemics through mass vaccination. 展开更多
关键词 hepatitis A vaccines persistent efficacy mass vaccination
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柯萨奇病毒A组6型VP1与白喉毒素无毒突变体GRM197融合蛋白的原核表达及其免疫原性
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作者 沈钱通 李思奇 +5 位作者 安彤 杨宏宏 张柯欣 陈刚 庄昉成 高孟 《中国生物制品学杂志》 CAS CSCD 北大核心 2022年第9期1050-1054,共5页
目的原核表达柯萨奇病毒A组6型(coxsackievirus A6,CVA6)VP1蛋白与白喉毒素无毒突变体CRM197片段A的融合蛋白(CRM197A-CVA6 VP1),并评价其免疫原性。方法将经密码子优化的CRM197A基因与CVA6 VP1基因连接,克隆至原核表达载体pET-28a中,... 目的原核表达柯萨奇病毒A组6型(coxsackievirus A6,CVA6)VP1蛋白与白喉毒素无毒突变体CRM197片段A的融合蛋白(CRM197A-CVA6 VP1),并评价其免疫原性。方法将经密码子优化的CRM197A基因与CVA6 VP1基因连接,克隆至原核表达载体pET-28a中,构建重组表达质粒pET-28a-CRM197A-CVA6 VP1,转化感受态E.coli BL21(DE3),IPTG诱导表达目的蛋白,经Ni-NTA柱层析及透析复性后获得重组蛋白CRM197A-CVA6 VP1,检测重组蛋白的粒径及电位,并进行蛋白荧光光谱检测。经沙鼠腹腔注射免疫铝佐剂吸附的重组蛋白CRM197A-CVA6VP1,20μg/(只·0.5 mL),同时设对照组(等体积的铝佐剂);1周后进行加强免疫,免疫途径及剂量同上。首次免疫后4周,经沙鼠眼眶采血,分离血清,ELISA法检测血清结合抗体,微量细胞病变法检测血清中和效价。相同方法对沙鼠进行分组及给药,于初次免疫4周后,经沙鼠腹腔接种CVA6病毒液,1×10^(4)TCID_(50)/只,观察沙鼠的存活情况。结果测序结果表明,重组表达质粒pET-28a-CRM197A-CVA6 VP1构建正确。重组蛋白CRM197A-CVA6 VP1的粒径为81.16 nm,电位为23.12 mV,280 nm激发光下检测到最大发射波长为353 nm,纯度达88.3%。试验组及对照组沙鼠血清中结合抗体效价的几何平均数分别为44565和0,中和抗体效价的几何平均数分别为30.4和0,两组间结合抗体效价和中和抗体效价的几何平均数差异均有统计学意义(P均<0.05)。对照组沙鼠于攻毒后第3天开始出现死亡,第13天全部死亡;试验组沙鼠在攻毒过程中未发现死亡,保护率达100%。结论原核表达的重组蛋白CRM197A-CVA6 VP1在沙鼠体内可产生良好的免疫原性。 展开更多
关键词 柯萨奇病毒A组6型 外壳蛋白VP1 原核表达 白喉毒素无毒突变体CRM197 免疫原性
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