这很重要，因为尽管对多数人来说，这种猪流感病毒相对较温和，但如果某些有健康隐患的人感染此病，后果可能相当严重。

This is important because although this strain of swine flu is mild in most people, if it's contracted by someone with an underlying health condition that can be serious.

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该病毒的猴版——猴免疫缺陷病毒（SIV）对猿猴所引起的感染大为温和。

The simian version of the virus causes a much milder infection in apes and monkeys. Photograph: Corbis

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尽管墨西哥的疑似死亡病例正在接受H1N1检验，但现在还不知道在那些没有接受检验的受感染区域中到底有多少属于温和型病例。

While suspect deaths in Mexico are being tested for H1N1, is not yet known how many mild cases of virus there may have been in the affected region that have gone untested.

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And he hypothesized that they were getting the disease in cows, which the disease from cows that caused a milder disease than smallpox, and that protected them from getting the more severe forms of smallpox later.

他假定奶牛将这种疾病传染给挤奶女工,这种源自奶牛的疾病比天花更温和,它保护女工们,免受更为严重的天花感染

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