PTV particles were detected via electron microscopy in the cytoplasm of nerve cells and the endothelial cells of blood vessels in the spinal cord of inoculated pigs .
Polymerase chain reaction analysis demonstrated the presence of PTV RNA in the CNS , tonsils and large intestines of 21 of the 22 pigs inoculated .
PTV particles were detected via electron microscopy in the cytoplasm of nerve cells and the endothelial cells of blood vessels in the spinal cord of inoculated pigs .
Polymerase chain reaction analysis demonstrated the presence of PTV RNA in the CNS , tonsils and large intestines of 21 of the 22 pigs inoculated .