A comparative study was carried out to determine the susceptibility of five different cell lines to pseudorabies virus (PRV), a herpes virus of pigs. The cell systems tested were swine testicle (ST), mink lung (ML), equine dermal (ED), porcine kidney (PK 15), and bovine turbinate (BT) cells. Virus titers obtained were 10 4.88, 10 4.38, 10 3.75, 10 2.63, and 10 0.25 for ML, ST, PK 15, BT and ED cells, respectively indicating that ML, ST, and PK 15 are optimal cell lines for the growth of PRV whereas BT and ED are not very sensitive.