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Two Cases of Human Schistosomiasis in New Localities in Thailand^*

Department of Tropical Medicine and Public Health, Tulane University School of Medicine, New Orleans, Louisiana, and U. S. Army SEATO Medical Research Laboratory (Bangkok), APO San Francisco 96346

Two cases of human schistosomiasis occurring in localities outside the known endemic area of Thailand are presented. Schistosome eggs were found in a subcutaneous nodule over the jaw of a 64-year-old woman from Phitsanuloke, and in the small intestine of an adult male who died at Ubol respectively. On the basis of the shape and microscopic appearance of the eggs, they are probably those of Schistosoma japonicum, although they are smaller than those described previously for this species. There are evidences suggesting the presence of a distinct geographic strain in Thailand. This is believed to be the third reported case of cutaneous or subcutaneous infection with S. japonicum.

^* This study was supported in part by Grant AI-04919 from National Institute of Allergy and Infectious Diseases, U.S. Public Health Service.

A satellite of the Walter Reed Army Institute of Research, Washington, D. C. 20012.