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A total of 2,936 persons was examined in Central Thailand for the presence of Fasciolopsis buski. The results support the conclusion that this infection is endemic in the examined areas where water caltrops (Trapa bicornis) are cultivated. A correlation between the degree of water pollution and incidence of infection was observed in different districts. The highest incidence and intensity of infection was found among children 10 to 14 years of age. To the authors' knowledge this is the first time that fasciolopsiasis has been reported as endemic in Thailand.
1 The authors wish to express their appreciation to Dr. Pramern Chandavimol, Chief of the Division of Communicable Disease Control, Thai Department of Health, for the constant and sympathetic interest in the project. The authors are also indebted to Dr. Vikit Virunavatti, Department of Medicine, Siriraj University Hospital, for bringing to their attention one of his patients with fasciolopsiasis.
2 Scientist, Division of International Health, United States Public Health Service.
3 Senior Technician, Department of Health, Thai Ministry of Public Health.
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