这种病毒很像1957-58年的“亚洲型流感”病毒，因此许多人已经有了一定的免疫力。

The virus was similar to the 1957-58 Asian flu, so some people may have had some level of immunity.

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迄今为止，亚洲、欧洲、非洲和中东的50多个国家报告了在家禽或野禽鸟身上发现了高致病性H5N1型禽流感。

To date, highly pathogenic H5N1 has been reported in domestic or wild birds in more than 50 countries in Asia, Europe, Africa, and the Middle East.

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这些项目将在两个拉丁美洲和四个亚洲国家进行，其中三个国家有人间H5N1型流感病例。

These projects will take place in two Latin American and four Asian countries, three of which have had human H5N1 influenza cases.

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