Background Paper The Appearance of the Porcine Respiratory Coronavirus has Created New Problems and Perspectives
In 1984, the appearance of a new porcine Coronavirus related to TGEV was suspected based on an unexpected but widespread prevalence of antibodies to TGEV found in the swine population of several European countries. Most remarkable was the observation that this widespread occurrence of TGEV antibodies was seen in the absence of previous outbreaks or epizootics of diarrhea and also the fact that such findings were made in countries, e.g. Denmark, which had never experienced TGEV infection previously. The ease with which the virus spread, not only within a country, but also across national borders, pointed towards long distance virus transmission, almost certainly by the aerogenic route.