一线国家是经证实存在耐药性的国家；二线国家与一线国家相邻或有大量来自一线国家的移民；包括非洲各国在内的其它国家为三线国家。
A tier-one country has confirmed resistance; a tier-two country is one that neighbours or has a significant migrant flow from a tier-one country. Tier three includes everywhere else, including Africa.
条例还包括国家确定其它事件是否构成国际关注的公共事件的矩阵。
The regulations also include a matrix for countries to decide whether other incidents constitute public health events of international concern.
同样，丝绸被引入其它许多国家，包括墨西哥。墨西哥的丝绸工业是1522年科尔特斯带进来的。
Likewise, silk was introduced to numerous other countries, including Mexico, where it was brought by Cortez in 1522.
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