An Overview: Vaccination to control fowl typhoid in Commercial layers, Sri Lanka

Poultry production and consumption in Sri Lanka, has been dramatically increased during last two decades and Salmonellosis was reported as one of the prevalent diseases in commercial layers. Both S.Gallianrum as well as S.Pullorum is causing severe economical impact to the industry, while S.Typhimurium and S.Enteritidis are also important in the public health aspects. Vaccination against Salmonellosis is widely practiced in several countries in the world to control the infection: In Sri Lanka, killed vaccine is permitted only for commercial layer, while breeder birds, commercial broilers are prohibited by regulation. Both Live attenuated and killed vaccine have many benefits, and proven results for controlling of none host- specific Salmonella in poultry and also in reducing the occurrence of human food born infections. Both vaccines were considered as potential to control the host specific Salmonella in poultry by reducing the mortality and feacal shedding to the environment. Evidencely, live vaccines are capable of controlling the human infections caused by non host specific Salmonella as a result of cross immunization in poultry. Since, Both vaccine given positive effect as well as negative effect to control the Salmonellsois in chicken and further studies are encouraged relevant to local situation.