“…Furthermore, PI animals are the single most important source of infection for other animals (Vilcek et al, 1997;Passler et al, 2007). Early detection and subsequent removal of PI animals is essential to a successful BVDV control programme (Moennig et al, 2005;Valle et al, 2005;Lindberg et al, 2006;Presi et al, 2011;Ridpath, 2012;Ståhl and Alenius, 2012). Although "an" OIE-listed disease, necessary national control programmes for BVDV does" not exist in many countries (Ackermann and Engels, 2006;Heffernan et al, 2009). ELISAs are preferred in studies of strategies for controlling BVDV infection because of their sensitivity and fast that allows the screening of many samples.…”