In two villages of north Ethiopia (Gorgora and Zerema) helminthologic stool analyses were performed and compared with seroimmunologic examinations. Regional difference could be obtained. The infection rate of males was slightly higher than that of females (except Schistosomiasis in Gorgora). Ascaridiasis, Ancylostomiasis and Trichuriasis are probably life-long accompanying parasitoses--they were slightly more frequent in higher than in lower age in Zerema--in contrast to Schistosomiasis which was slightly more frequent in younger people (differences not significant, likely due to the small number of examined persons). Toxocariasis in man is probably not very common in this region. The values of such pilot studies and of seroimmunologic findings for epidemiologic field investigations are discussed.
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