The influenza a (H1N1) has more strong infectious ability than the seasonal influenza, the latent period is short, so the group infection will be raised easily and become international transmission.

甲型H1N 1流感比季节性流感有更强的传染性，潜伏期相对比较短，容易导致集团感染和跨国传播，成为国际公共安全的问题。

youdao

The rate of infection in the first group was almost 40% less than in the second; the gel's most diligent users saw a reduction of over 50%. And no adverse side-effects were observed.

第一组的感染率比第二组少了将近40%，而经常使用该凝胶剂的人感染率更是减少50%并且无发现任何副作用。

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Overall infection rate is low, but high among people in their 20s-the most economically productive age group.

总体感染率较低，但在20多岁这一最具经济活力年龄组别人群中的感染率较高。

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In the same period of 2001 there were 79 confirmed cases of group C meningococcal infection and three deaths.

BBC: Syringe

In the first nine months of 1999, before the immunisation campaign started, there were 551 confirmed cases of group C meningococcal infection and 47 deaths.

BBC: Syringe

The nonprofit safety group Leapfrog collects infection rates, for example.

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