Abstract
SUMMARY Two closely related viruses, designated T 80 and T 52A, were recovered at slaughter from the tonsils of ‘normal’ bacon pigs. From the faeces of one of these two pigs a similar virus was isolated. Boththe T 80 and T 52A strains produced a polio-encephalomyelitis when inoculated into pathogen-free, colostrum-deprived piglets. Both strains caused cytopathic changes in pig kidney monolayers similar to those induced in monkey kidney cells by human poliovirus. The titres reached in infected tissue culture fluids were of the order of 106 TCID50 per ml. The size of the virus as determined by filtration through gradocol membranes was about 30 mµ.
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