But the disease also appeared in a cooler climate in two thousand seven, causing concern about its spread.

VOA: special.2009.04.13

But unlike the Cowpox virus, vaccinea, that we talked about before, this is the real disease causing agent.

但是同我们之前曾讨论过的,牛痘病毒疫苗的不同之处在于,这是可以直接致病的病毒

耶鲁公开课 - 生物医学工程探索课程节选

A group of scientists, mainly in Boston found, importantly, that they could cultivate the polio virus, the disease causing polio virus; they could cultivate it in cell culture.

在波士顿有一队科学家有了重大发现,他们可以培养脊髓灰质炎病毒,也是就引发小儿麻痹症的病毒,他们可以通过细胞培养来孵育这种病毒

耶鲁公开课 - 生物医学工程探索课程节选

But HEPA filters cannot remove disease-causing particles smaller than zero point three microns.

VOA: special.2009.07.14