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.
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