这几个国家的甲型H1N1流感病例最多。

Those countries have seen the largest number of cases.

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在众多国家中，这几个国家有什么共同点呢？

What do those countries, among many others, have in common?

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同时，这几个国家位居全球生活质量排行榜前列。

Those countries also consistently top global rankings for having the best quality of life.

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It's only endemic, that means only naturally occurring in certain countries.

这是种地方性疾病,这意味着仅在几个特定国家中发病

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