Many genes such as Major Histocompatibility Complex (MHC), Caspase1, NRAMP Family, inducible nitric oxide synthase (iNOS), those encoding complement proteins and Toll-like Receptor 4 (TLR4) have been found to be associated with resistance against Salmonella infection in poultry [7]. The gene discussed is NOS2; the disease is Salmonella Infections.