Growth differences in of PRRS infected (CHAL) and PRRSV-naïve (CONT) gilts. Gilts were placed on test at 33.6 kg BW and taken to a target market BW of 128 kg. At dpi 0, the CHAL gilts were inoculated i.m. with a live PRRSV strain. The CONT gilts received a saline vehicle.