Eosinophilic myositis resulting from sarcocystosis

Muscle sarcocystosis is a parasitic infection acquired by ingestion of sporocysts of Sarcocystis species. A case is described where symptoms of fever, chronic myositis and eosinophilia were present. Diagnosis was made via muscle biopsy. Improvement and cure coincided with treatment with cotrimoxazole. A limited review of human muscle sarcocystosis and an outline of the gaps in the knowledge of this infection is presented.