“…The incidence of antibodies to HSV-l increases with age but varies considerably with socioeconomic conditions (3,5,7,9,10) . Our group has reported a difference in age distribution of antibodies to HSV-l among the sera from Fukuoka, Manila, Busan, and Indonesia (1,4) . Since no seroepidemiological studies on HSV-l infection in China have been reported, sera from 158 individuals in Yanji, Jilin, an area in northeastern China, were tested for antibodies to HSV-l by the passive hemagglutination (PHA) method.…”