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Unlabelled: A national survey was carried out to assess the prevalence of helminth infections in all four geographical zones of Guinea (the four official names should be used. Guinée forestière, Haute Guinée, Moyenne Guinée and Basse Guinée) to provide information on which a school-based intervention program could be developed. The program, financed by the World Bank, would consist of vitamin supplementation, antihelmintic treatment and hygiene education., Methods: The survey was conducted between April and June, 1995. Two prefectures (administrative areas) were selected to represent each zone, in each prefecture, one child between the age of 10 and 14 years old from each of 100 households was included in the study. Thus 800 children were enrolled. One fresh stool and one urine specimen per child were examined for the presence of parasites using the Kato-Katz method and routine microscopy., Results: The following overall prevalences were obtained: bookworm (43.9%); Schistosoma mansoni (25%); S. haematobium (19.9%) Trichuris trichiura (13.5%); Ascaris lumbricoides (9.5%); Strongyloides stercoralis (6.4%) and Taenia spp (3.8%). More than 70% of the children were infected by at least one helminth. The majority (63%) of the infections were infections with only one parasite. Only 8% had three or more helminths. More boys than girls were infected (74.3% vs. 65.2%). Helminth infection was significantly associated with region, gender and school attendance as assessed by logistic regression analysis. The prevalence of Ascaris, S. mansoni and bookworm infections were higher in Guinée forestière than any other zone, although hookworm infections were common in all zones (prevalences of between 26% and 71%). The distribution of the other helminth infections differed substantially between the regions. Trichuris was most common in Conakry, Strongyloides in Boké, Taenia in Labé, and Schistosoma infections in both Haute Guinée and Guinée forestière., Conclusion: The prevalence of helminth infection in Guinea is high, and there is a regional distribution. Both these factors should be taken into account when planning the school-based supplementation, treatment and education intervention program.