国外有用幼儿急疹患儿急性期的滤过血清接种易感婴儿引起感染的报告,说明幼儿急疹病原体是病毒,但多年来一直未能分离出病因病毒。美国学者Salah-uddin 1986年报道,从淋巴系统疾病患者血中分离出一种新病毒,属疱疹病毒科,即人疱疹病毒6型(HHV-6)。1988年日本学者山西等人报道HHV-6是幼儿急疹病因病毒。根据生物学、免疫学及分子病毒学研究分析证实本病毒完全不同于其他已知的人类疱疹病毒,是一种新发现的人类疱疹病毒。 Foreign children with acute eruption in children with filtered serum-susceptible infants inoculated infection report shows that children with acute rash pathogen is a virus, but has been unable to isolate the etiology of the virus over the years. American scholar Salah-uddin reported in 1986 that a new virus was isolated from the blood of patients with lymphatic system diseases, belonging to the herpes virus family, ie, human herpesvirus 6 (HHV-6). In 1988, Japanese scholar Shanxi et al. Reported that HHV-6 is an etiological virus of young children. According to biological, immunological and molecular virological studies confirmed that the virus completely different from other known human herpesvirus, is a newly discovered human herpesvirus.