modest genetic differentiation among north american populations of sarcocystis neurona may reflect expansion in its geographic range.sarcocystis neurona is an important cause of neurological disease in horses (equine protozoal myeloencephalitis, epm) and sea otters in the united states. in addition, epm-like disease has been diagnosed in several other land and marine mammals. opossums are its only definitive hosts. little genetic diversity among isolates of s. neurona from different hosts has been reported. here, we used 11 microsatellites to characterize s. neurona dna isolated from natural infections in 22 sea otters (enhyd ...200818243561
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