Schizonts of Sarcocystis speeri Dubey and Lindsay, 1999 were cultured in vitro in bovine monocyte and equine kidney cell cultures inoculated with infected tissues of nude and γ-interferon knockout mice fed sporocysts from opossums, Didelphis albiventris. At least 1 asexual cycle was completed in 3 days. In vitro-grown merozoites were structurally and antigenically distinct from those of Sarcocystis neurona and Sarcocystis falcatula. Culture-derived merozoites of S. speeri were not infective to budgerigars (Melopsittacus undulatus).
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