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八十年前下定义的第五病或叫传染性红斑,在经历八十年的不明状况后,最近已归因于人类微小病毒B_(19),是由这种在1975年发现的孤儿病毒引起的一种疾病,亦即“由人类微小病毒引起的急性红斑病。”此病常见于学校及其他公共机构,也有大的人群暴发的报告。此病是一种以两颊红斑(“挨耳光脸”)、在肢体有继发性皮疹和轻微全身不适为特征的轻型急性感染。典型病例两颊有鲜红色突起的红斑,常越过鼻梁向除口周以外的面部扩散。在大约一天后可出现继发性皮疹,其形状多变,先是斑点状,然后消退变为花边状,受热和压刺激后可变得更突起。
The fifth disease, or infectious erythema, defined eight decades ago, has recently been attributed to the human parvovirus B_ (19) after eight decades of unknown status and is caused by the orphan virus found in 1975 A disease caused by acute human erythema caused by human parvovirus. “The disease is common in schools and other public agencies and reports of large population outbreaks. The disease is a mild acute infection characterized by erythema on both cheeks (”face-lift"), secondary rashes in the limbs and minor generalized malaise. Typical cases have bright red erythema on both cheeks, often across the bridge of the nose to the mouth except the perioral spread of the face. In about a day after secondary rash can occur, its shape changeable, first spotted, and then disappear into a lace-like, heat and pressure can become more prominent stimulation.