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isolation of sarcocystis speeri dubey and lindsay, 1999 parasite from the south american opossum (didelphis albiventris) from argentina.sarcocystis sporocysts from the intestines of 2 opossums (didelphis albiventris) from argentina were fed to gamma-interferon knockout (ko) and nude mice. protozoal schizonts were seen in brain, liver, spleen, and adrenal glands of mice examined 33-64 days after feeding sporocysts. sarcocysts were seen in skeletal muscles of ko mice 34-71 days after feeding sporocysts. schizonts and sarcocysts were structurally similar to sarcocystis speeri dubey and lindsay, 1999 seen in mice fed sporocysts from ...200010701583
experimental transmission of sarcocystis speeri dubey and lindsay, 1999 from the south american opossum (didelphis albiventris) to the north american opossum (didelphis virginiana).sarcocystis speeri dubey and lindsay, 1999 from the south american opossum didelphis albiventris was successfully transmitted to the north american opossum didelphis virginiana. sporocysts from a naturally infected d. albiventris from argentina were fed to 2 gamma-interferon knockout (ko) mice. the mice were killed 64 and 71 days after sporocyst feeding (daf). muscles containing sarcocysts from the ko mouse killed 71 daf were fed to a captive d. virginiana; this opossum shed sporocysts 11 days a ...200010864267
in vitro cultivation of schizonts of sarcocystis speeri dubey and lindsay, 1999.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 gamma-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 ...200010958438
molecular characterization and development of sarcocystis speeri sarcocysts in gamma interferon gene knockout mice.the north american opossum (didelphis virginiana) is the definitive host for at least three named species of sarcocystis: sarcocystis falcatula, sarcocystis neurona and sarcocystis speeri. the south american opossums (didelphis albiventris, didelphis marsupialis and didelphis aurita) are definitive hosts for s. falcatula and s. lindsayi. the sporocysts of these sarcocystis species are similar morphologically. they are also not easily distinguished genetically because of the difficulties of dna e ...201526303093
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