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本来流行病学限于研究大量人群中传染病的大规模暴发;新近又赋于它较广的含义,即流行病学研究人群中疾病的分布和动力学,以及影响这些特性的因素。临床医生关心个体患者的疾病,流行病学家则研究一个集团内疾病的发病情况。疾病分布的研究包括鉴定受影响人群的特殊部分,如;疾病较常发生于男性或特殊的年龄组?疾病动力学
Epidemiology was originally limited to the study of large-scale outbreaks of infectious diseases in large numbers of people; it has recently been given the broader meaning of the distribution and dynamics of diseases in epidemiological studies and the factors that influence these characteristics. Clinicians are concerned with the disease of individual patients, and epidemiologists study the incidence of disease within a group. Studies of disease distribution include identifying specific parts of the affected population, such as: Does the disease occur more often in men or special age groups? Disease dynamics