Infectivity of porcine circovirus type 2 DNA in semen from experimentally-infected boars Darin M. Madson, Sheela Ramamoorthy, Chris Kuster, Narinder Pal, Xiang-Jin Meng, Patrick G. Halbur and Tanja Opriessnig Vet. Res., 40 1 (2009) 10 Published online: 31 October 2008 DOI: 10.1051/vetres:2008048