[Investigation of the prevalence of swine torque teno virus in Austria].

In the present retrospective study, serum samples from a total of 253 pigs of different age groups from 83 farms collected in the year 2008 were included.The sera were analysed for the presence of torque teno virus (TTV) genogroups 1 and 2. Furthermore, the correlation between TTV and PCV-2 was investigated. 62.1% of the pigs were positive for TTV1 and/or TTV2 by PCR. 21.7% of the samples were positive for TTV1 and TTV2, 16.2% only for TTV1 and 23.3% only for TTV2. In 80.7% of the investigated farms at least one animal was TTV positive. In the growing and fattening period significantly more pigs were positive for TTV than in other age classes. A positive association was found between TTV1 and IgM against PCV-2, between TTV2 and PCV-2 results by in situ hybridisation (ISH) as well as TTV1 and TTV2 and PCV-2 results by qPCR. A significant correlation could also be seen between the diagnosis,porcine respiratory disease complex (PRDC)" and the detection of TTV, whereas there was none to the diagnosis "porcine dermatitis and nephropathy syndrome (PDNS)". In the present study, TTV was detected in Austria for the first time.