一、在防制过程中寻找依稀可见的流行病学特点传染性非典型肺炎 [严重急性呼吸综合征(severeacuterespiratorysyndrome ,SARS) ]与其他传染病一样 ,流行必须具备三个条件 ,即传染源、传播途径和易感人群 ,统称流行过程三环节。只有三个环节共同存在 ,而且在一定的自然因素和社 First, looking for vague epidemiological features in the prevention and control process SARS [Severe acute respiratory syndrome (SARS)] Like other infectious diseases, the epidemic must have three conditions, namely, the source of infection, transmission Pathways and susceptible populations, collectively referred to as the third part of the epidemic. Only three links co-exist, but also in certain natural factors and community