摘要
根据禽流感病毒（ＡＩＶ）Ａ／Ｃｈｉｃｋｅｎ／Ｂｒｅｓｌｉｎ／１９０２（Ｈ７Ｎ７）株的血凝素（ＨＡ）基因参考序列设计合成一对Ｈ７ＨＡ特异引物，并应用ＳＤＳ－蛋白酶Ｋ法提取病毒ＲＮＡ，建立了逆转录－聚合酶链式反应（ＲＴ－ＰＣＲ）检测ＡＩＶＲＮＡ的方法。应用此法对鸡胚培养的ＡＩＶ尿囊液、ＳＰＦ感染鸡粪便进行了检测，并与琼脂扩散试验和电镜技术作了对比。特异性试验以新城疫病毒（ＮＤＶ）、传染性法氏囊病病毒（ＩＢＤＶ）、传染性支气管炎病毒（ＩＢＶ）、减蛋综合征病毒（ＥＤＳ－７６Ｖ）等的感染鸡胚尿囊液作为对照。结果表明，ＡＩＶ尿囊液ＲＴ－ＰＣＲ全部阳性，ＳＰＦ感染鸡粪便８７份，ＲＴ－ＰＣＲ检出６９份阳性，样品处理浓缩后琼脂扩散检出１１份，电镜检测了２３份样品，仅检出２份阳性。非特异性对照样品经ＲＴ－ＰＣＲ检测全部阴性。将ＡＩＶ感染鸡胚尿囊液作１０倍系列连续稀释，可检出稀释度为１０－２的病毒尿囊液。ＲＴ－ＰＣＲ最早检出时间为感染后第３天，而琼扩和电镜均是７天。该法具有高度的特异性和灵敏性，且节约时间（只需８小时左右）。
This paper described that one pair of conservative sequences was chosen as primers and a reverse transcription polymerase chain reaction(RT PCR)was developed for detection of viral RNA from avian influenza virus(AIV)infected specimen samples.The viral RNA was extracted by SDS proteinase K method and a recombinant plasmid containing haemagglutinin(H)gene cDNA of AIV was used as positive control.The results showed that off 87 samples collected between 2～11 days post infection,69 were positive detected by RT PCR,and only 11 were positive by agar gel precipitin(AGP) test.In addition,2 positive samples out of 23 tested samples were detected by electronic microscopy(EM).Furthermore,the viral RNA could be reveled as early as the 3rd day postinfection by RT PCR,while the positive sample could not be indicated until the 7th day postinfection by AGP and EM.The results suggested that RT PCR was more sensitive,specific,rapid and simple,and could be applied for study on pathogenesis of AIV in molecular level and early clinical diagnosis.
关键词
禽
RT-PCR
诊断
流行性感冒
Avian influenza Polymerase chain reaction Diagnosis
