Are there immune gene alleles that determine whether a pig will be healthy?

It is a difficult task to establish whether there are immune gene alleles that determine whether a pig will be healthy. Most scientists would agree that it is not possible to select pigs that resist all diseases. Like humans, genetic alleles determining inheritance of many congenital diseases have been identified and defects controlled, e.g., porcine stress syndrome. Data on genetic susceptibility to different cancers and autoimmune diseases in humans are being accumulated. But there is limited information on natural, or genetically encoded, infectious disease resistance. This paper addresses the more difficult issue of resistance to infectious diseases in pigs.