【单选题】【消耗次数：1】
检测禽流感免疫抗体常用的方法是
①
琼脂扩散试验
②
血清凝集试验
③
血凝和血凝抑制试验
④
ELISA
参考答案：
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在血凝抑制试验中,试验成立的条件是
①
无血清样品孔完全凝集，无红细胞沉积点
②
空白孔红细胞沉积并呈泪滴状流下
③
无血清样品孔完全凝集，无红细胞沉积点，空白孔红细胞沉积并呈泪滴状流下
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时间到即可读数
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血凝抑制试验的加样顺序是
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PBS液--被检血清--4单位病毒--1%红细胞悬液
②
1%红细胞悬液--PBS液--被检血清--4单位病毒
③
4单位病毒--1%红细胞悬液--PBS液--被检血清
④
被检血清--4单位病毒--1%红细胞悬液--PBS液
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