显而易见，家禽的流动和交易对禽流感病毒的播散起到了很大作用。
It is clear that the movement and trade of poultry is making a big contribution to the spread of the virus (see article).
多个医学中心的监测数据表明艾滋病毒感染婴儿罹患播散性卡介菌病的风险明显高于之前的估计，尽管目前的数据可能还是低估的。
Multicentre surveillance data showed that the risk of disseminated BCG disease in HIV-infected infants is considerably higher than previously estimated, although likely to be under-estimated.
将播散性卡介菌病新增病例的数量作为分子，这一数据从多个医学中心从2004年至2006年有计划地监测确定感染艾滋病毒的婴儿获得的数据中获取。
The numerator, or number of new cases of disseminated BCG disease, was derived from multicentre surveillance data collected prospectively on infants with a confirmed HIV infection during 2004–2006.
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