预防、治疗和控制传染病、风土病、职业病和其它的疾病；和。
Prevent, treat and control epidemic, endemic, occupational and other diseases; and.
这些相同的术语，流行病和风土病，也常用来划分病原。
These same terms, epidemic and endemic, are also used to classify agents as either endemic or epidemic.
风土病。疾病或健康欠佳状态总是在人群(宿主)中以一定比例存在。参见流行病。
Endemic. The disease or condition of ill health that is always present in about the same percent of the population (hosts). See epidemic.
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