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BACKGROUND Diagnosis of schistosomiasis remains elusive soon after infection. We evaluated several diagnostic methods in a cluster of travelers simultaneously exposed to freshwater in South Africa. METHODS Eosinophil count, schistosome antibody tests, stool and urine microscopy, and serum Dra1 PCR assays were performed at week 4-5 (w4-5, early symptomatic phase), week 7-8 (w7-8, praziquantel treatment), and week 12-14 (w12-14, post-treatment). Sequencing was done on serum of 3 patients to identify the species. RESULTS Of the 34 travelers