The endemic distribution of IDD in Hubei province is closely related to topography, soil, land features, stratum- lithology, iodine content in drinking water and tectonic zones.

湖北省碘缺乏病的流行分布与地势、地貌、土壤、地层岩性、饮水中的碘含量以及构造带密切相关。

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It was once considered a disease of the tropics, endemic in only nine countries, but globalisation, urbanization, climate change and jet travel are helping it to move into more temperate zones.

登革热曾一度被看做是热带疾病，只会在九个国家中传染。但是全球化、城市化、气候变化、以及航空飞行让其进入了更多的温带地区。

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