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麻疹这一古老的传染病一度由于疫苗的广泛应用而得到基本控制。但近十年来、世界范围内出现了多次疫情爆发，且流行病学和临床表现有了新的特点，从而重新引起了各国政府机构和医学专家的重视。流行病学的新特点及原因虽然麻疹流行各年龄组均有发生，但近年来以学龄前儿童与20?
The ancient epidemic of measles was once largely controlled by the widespread use of vaccines. However, in the recent ten years, there have been many outbreaks of epidemics in the world and new characteristics of epidemiology and clinical manifestations have emerged, thus re-attracting the attention of government agencies and medical experts in various countries. New Epidemiological Features and Reasons Although the prevalence of measles has occurred in all age groups, but in recent years, preschool children and 20?