An immunogenically active component useful for preventing or ameliorating equine protozoal myoencephalitis disease which comprises merozoite antibody inducing whole cells of {TAIL ~ a Sarcocystis neurona isolate} designated {HEAD ~ SNg}, having ATCC Accession No PTA 2972 or a subculture thereof 
An immunogenically active component useful for preventing or ameliorating equine protozoal myoencephalitis disease which comprises merozoite antibody inducing whole cells of { TAIL ~ a Sarcocystis neurona isolate } designated { HEAD ~ SNg } , having ATCC Accession No PTA 2972 or a subculture thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH