Objective The purpose of this study was to canvass the rules, characteristics and influential factors of epidemic encephalitis B (abbr. type B encephalitis) in order to provide a scientific basis for implementation of preventive and cure countermeasures.

• 目的分析流行性乙型脑炎(简称乙脑)的流行规律、流行特征及其影响因素,为制定防治对策提供依据。