“…The finding concerning a knockdown of some viral genes that can inhibit virus multiplication has generated a great effort to develop siRNA as a possible antiviral agent. This novel approach has been reported to inhibit replication of viruses like foot-and-mouth disease virus, Marek΄s disease virus, avian influenza virus, infectious bronchitis virus, porcine reproductive and respiratory syndrome virus, pseudorabies virus, rabies virus, avian leucosis virus, bovine ephemeral fever virus, chicken infectious anemia virus and bovine herpes virus (Chen et al, 2004;Levy et al, 2005;Li et al, 2005;Liu et al, 2005a;Huang et al, 2006;Klupp et al, 2006;Brando et al, 2007;Chen et al, 2007;Chuang et al, 2007;Hinton and Doran, 2008;Narute et al, 2009).…”