Numerous other arthropod, protozoal, and parasitic infections have been described. Extracellular metabolite analysis to evaluate pathogenic mechanism of intracellular protozoal parasite. Immunohistochemical study to demonstrate Sarcocystis neurona in equine protozoal myeloencephalitis. The drugs have been found to have activity against both viral and protozoal infections. Diagnosis of equine protozoal myeloencephalitis&colon; Western blot analysis. Eosinophilia may also be seen unlike in the case of other protozoal infections. Infectious keratitis can be bacterial, fungal, viral, or protozoal. Experimental infection of horses with S. neurona merozoites as a model for Equine Protozoal Myeloencephalitis. Experimental induction of equine protozoal myeloencephalitis in horses using Sarcocystis sp. Cytokine Gene Expression in Response to SnSAG1in Horses with Equine Protozoal Myeloencephalitis. Plasmodium vivax is a protozoal parasite and a human pathogen. Characterization of a Sarcocystis neurona isolate from a Missouri horse with equine protozoal myeloencephalitis. In May 1996, Dash for Cash developed complications from equine protozoal myeloencephalitis and was euthanized. A protozoal parasite in their blood, "Haemoproteus manwelli", has been described from India.