也许猪流感已经在那些地区传播了数周，但我们可能要等上一段时间才能获悉那些国家疾病流行的真实情况。

The disease could have been there for weeks, but the true nature of the spread in those countries may take some time to emerge.

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方法采用半定量pcr方法检测了我国四种小型猪内源性逆转录病毒基因的拷贝数。

Methods Semi-quantitative PCR method was used in this research to estimate PERV copy-number of four mini-pigs in China.

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现在让我们对美国也做同样的计算，减去从加拿大进口和从美国屠宰的全部猪的总数，然后除以美国种猪群体数。

Now lets do the same calculation for USA subtracting all pigs imported from Canada from USA slaughter total and then divide by U. s breeding herd.

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