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The authors give an account of the finding of sporocysts of the Sarcocystis spp. in 14 Vietnamese apprentices from a total of 1228 examined (1.1%) who came to Central Slovakia in the course of 18 months in 1987-1989. The mean period of sporocyst excretion was 49.2 days. The positive subjects did not report gastrointestinal complaints despite mixed intestinal parasitoses. The subjects were from the north eastern part of the country from Hanoi-Haiphong areas and they did not report that they ate raw meat. The authors evaluate the diagnostic value of different coprological methods whereby they found the highest detection rate in faecal smears examined by Heine's method. The authors draw attention to the fact that the diagnosis of sporocysts of human coccidiae calls for personal diagnostic experience as they may escape attention or be mistaken for cysts of other intestinal protozoa.