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本病是多发生在婴幼儿的一种急性传染病。它的名称很多,有按疹子的形态而命名,如婴儿玫瑰疹、婴儿蔷薇疹、假性风疹等;有按出疹时间命名,如三日热疹和幼儿三日热疹症等;有按发病情况而命名,如危急疹,危急疹前热,突发性发疹,发疹热,新发疹热等;还有把它列为小儿第六种病者。现在一般文献及教本通用名称为幼儿急疹。本病的病原体据多数学者臆测是滤过性病毒,但还未能分离出病毒来。本病有传染性,但并不像麻疹、水痘那样强烈,发病数不很高。一般认为幼儿急疹的特点是突然起病,高热3～4天,退热时周身出现皮疹,2～3天后,皮疹消退,并不呈色素沉着。预后良好,至目前为止,尚未有死亡病例的报告。
This disease is an acute infectious disease that occurs in infants and young children. Its name is many, according to the shape of the rash and named, such as baby rose rash, baby rose rash, pseudo-rubella, etc .; according to rash time named, such as three days of heat rash and child care three days of rash; The incidence of naming, such as critical rash, the risk of acute rash, sudden rash, rash fever, new rash fever; also put it as a child of the sixth kind of disease. Now common literature and textbooks common name for children acute rash. According to the majority of scholars speculate that the pathogen of the disease is a viral virus, but has not been able to separate the virus. The disease is contagious, but not as measles, chicken pox as strong, the incidence is not very high. It is generally believed that the sudden onset of acute rash in children is sudden onset, high fever 3 to 4 days, skin rash occurs when fever, 2 to 3 days, the rash subsided, not pigmentation. The prognosis is good, and so far no reports of deaths have been reported.