慢性病原挤带者因其挤带病原时间长,具有重要的流行病学意义。
Because the chronic cause of disease pushing belt it pushes the belt cause of disease time to be long, has the important epidemiology significance.
目的阐明中国人口、世界人口平均寿命的水平与特征以及流行病学意义。
Objective to expound the level and characters of life expectances in world and Chinese population and to discuss the meaning of life table in epidemiologic research.
目的:了解幽门螺杆菌(hp)在外环境的存活力,以及其流行病学意义。
To investigate survival ability of Helicobacter Pylori (HP) in the environment and its epidemiological implications.
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