We report a case of a 41-year-old female patient presenting with watery diarrhoea and myalgia in the winter-season. Before her symptoms started she had participated in a pig slaughtering with her family. Some of the family members also became ill. On her physical examination periorbital odema and myalgia were found. Eosinophilia, hypalbuminaemia, elevated lactate dehydrogenase and creatin kinase levels were detected on laboratory investigations. The clinical picture, the laboratory findings and background epidemiological data implied the diagnosis of trichinellosis and albendazol was started. Serum gained on the 22nd post-infectious day turned out to be equivocal for trichinellosis. For this reason and because of the refractory fever a muscle-biopsy was done. Granulomatous myositis described by histology and Trichinella seropositivity from the repeated serum sample on the 62nd post-infectious day finally confirmed the diagnosis. During the course of the disease, we experienced elevation of troponin I suggesting myocarditis, but it was accompanied neither with abnormal ECG signs nor characteristic symptoms. Almost a century ago, a case report was published in Hungarian with a similar introduction. Trichinellosis in that epidemic setting led to the death of five people. Orv Hetil. 2019; 160(24): 952-957.