治后儿童的再感染是血吸虫病控制规划中的重要问题。Butterworth等(1987)及Butterworth(1988)在非洲的观察表明,某些儿童对再感染有相当的免疫力。Krugger(1990)认为儿童白细胞对埃及血吸虫卵粘附作用强度(LAS)与年龄有关,即年长儿童的LAS低于年幼者。本文对南非东德兰士瓦Friedenheim小学11～18岁的28名儿童,测定LAS后,给予吡喹酮治疗。10个月后,采用Visser和Pitchford蠕虫卵过滤法,复查21例,其中 Re-infection of children after treatment is an important issue in schistosomiasis control programs. Observations in Africa by Butterworth et al. (1987) and Butterworth (1988) show that some children are fairly immunized against re-infection. Krugger (1990) suggested that childhood leukocyte adhesion strength (LAS) to Schistosoma mansoni eggs is age-dependent, ie, older children have lower LAS than young ones. In this study, 28 children aged 11 to 18 years old from Friedenheim Primary School in East-Germany were enrolled and treated with praziquantel after LAS. After 10 months, 21 patients were examined using the Visser and Pitchford worm eggs filtration method