传染病发生和流行的三个基本环节
(1)传染源,主要包括传染病患者、病原携带者、受感染的动物等;(2)传播途径,如空气飞沫传播、饮食传播、虫媒传播、医源性传播、土壤传播等;(3)易感人群:是指对某一传染病缺乏特异性免疫力或免疫力较弱的人,受感染后易发生此病。(名词解释)
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