Like polio, smallpox was a viral disease for which effective, easily administered vaccines existed.

和小儿麻痹症一样，天花是一种可以被存活的疫苗简单有效的治理的病毒性疾病。

Having eliminated one viral disease, the authorities decided they ought to be able to get rid of another: polio.

在消灭了一种病毒疾病后，权威专家们认为他们有能力再消灭另一种病毒：脊髓灰质炎病毒。

Scientists have observed that bromelain has a host of other potential uses too, including as a treatment for osteoarthritis, autoimmune diseases, viral infections, burns, and breast cancer.

科学家观察到，菠萝蛋白酶也有许多其他潜在用途，包括作为骨关节炎、自身免疫性疾病、病毒感染、烧伤和乳腺癌的治疗方法。

In 2009 production was stopped for more than a month after these delicate cells caught a viral disease. That shutdown cost hundreds of millions of dollars.

2009年，那些脆弱的细胞感染了一种病毒性疾病，致使健赞停产一个多月，损失数亿美元。