2004年所作的一项调查发现，计划免疫活动开始以来出生的儿童中，有5.2%的7至12岁儿童呈乙肝抗原阳性反应。
A 2004 survey found that, among children born after the start of the vaccination programme, 5.2% of those aged seven to 12 years were hepatitis b-antigen-positive.
在英国，官方强调，在墨西哥城飞往希西罗机场的班机航程中有类似感冒症状的乘客事后检测没有发现猪流感阳性反应。
In England, authorities stressed that a crew member who developed flu-like symptoms during a flight from Mexico City to Heathrow did not test positive for swine flu.
对部分经潮霉素筛选得到的再生植株进行了多次重复P CR检测，发现其中40 %以上的潮霉素抗性植株均表现出较强的阳性反应，初步证明几丁质酶基因已整合到油菜细胞核基因组中。
PCR test of the resistant plants indicated that 40% of the Hyg-resistant plants showed strong positive reaction, suggesting that chitinase gene had been integrated into the genome of rapeseed.
结果发现：肾错构瘤中未见pcna着色，在正常肾组织中仅见少许细胞着色，而肾癌所有切片均呈阳性反应。
The results were as follows: no positive immunostaining cell was found in renal angiomyolipoma, a few cells in normal renal tissue were stained, and PCNA was expressed in all renal cancer specimens.
病理学检查，20例中18例发现结核病理变化，细菌学检查，其中17例呈阳性反应，另12例阴性奶牛，经病理学，细菌学检查，全部阴性。
The tuberculous pathologic changes were seen in 18 cases of 20 and 17 were bacteriogically positive, the other 12 were negative both pathologically and bacteriologically.
92份北京地区献血员及142份美国献血员血清未发现假阳性反应；
All sera from 92 blood donors from Beijing and 142 blood donors from Atlanta, U. S. A.
92份北京地区献血员及142份美国献血员血清未发现假阳性反应；
All sera from 92 blood donors from Beijing and 142 blood donors from Atlanta, U. S. A.
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