Porcine teschovirus (PTV) is a picornavirus of swine that can cause a wide range of clinical signs. Most of the 11 serotypes are widely distributed and infect pigs asymptomatically or cause disease only in young animals. However, some strains of the most virulent serotype (PTV-1) cause teschovirus encephalomyelitis, a highly contagious, often fatal, neurological disease that affects pigs of all ages. Severe outbreaks were reported in Europe from 1929 to the 1950s, with the virus spreading to other continents; however, this disease disappeared from Western Europe after 1980 and has become very rare in other areas. It appears that the most virulent strains of PTV-1 have been replaced in most swine populations by less pathogenic strains.
Iowa State University
Iowa State University Center for Food Security and Public Health, "Teschovirus Encephalomyelitis and Porcine Teschovirus Infection" (2009). Center for Food Security and Public Health Technical Factsheets. 55.