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在那些没有实施常规麻疹疫苗接种的国家,大部分儿童在出生头几年就感染麻疹。未患麻疹的成人,不是免予暴露,就是有应答而没有出现特殊的皮疹。通常,麻疹抗体的出现被作为既往感染的证据,但在目前的研究中,它被认为是病毒感染的证据,并非必须有临床麻疹。对麻疹皮疹的发病机理,虽有一定认识,但尚未十分明了。皮疹出现后24～48小时,可首先测得循环抗体。血内丙种球蛋白缺乏儿童会出现皮疹和免疫性,而细胞免疫缺陷的儿童感染后可能引起无疹性巨细胞肺炎。出疹后3～4天麻疹病毒抗
In countries where routine measles vaccination is not practiced, most children become infected with measles in the first few years of life. Adults without measles are either not exposed or have a specific skin rash. In general, the appearance of measles antibodies is used as evidence of previous infection but in the current study it is considered evidence of a viral infection and clinical measles is not necessary. The pathogenesis of measles rash, although a certain understanding, but not yet clear. 24 to 48 hours after the rash appears, circulating antibodies can be measured first. Blood gamma globulin deficiency in children with rash and immunity, and immunodeficiency children infected may cause non-eosinophilic pneumonia. 3 to 4 days after the measles virus measles virus