Findings are described of small (8-10 microns) coccidian oocysts in the stools of 9 patients presenting with diarrhoea, all of whom with a history of travelling in South Asia and/or South America in the years 1986 and 1987. There was no indication of immunodeficiency. These oocysts, which were immature in freshly excreted stools, could be induced to sporulate into a two-sporocysts stage and are now recognized as Cyclospora spec.
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