From January 1995 through July 1998, we investigated the occurrence of Cycl
ospora cayetanensis infection associated with gastrointestinal illness or d
iarrhea in foreign residents and natives of West Java, Indonesia. We found
that C. cayetanensis was the main protozoal cause of gastrointestinal illne
ss and diarrhea in adult foreign residents during the wet season. The paras
ite rarely caused illness in the indigenous population or in children.