Yearly approximately 80 million cases of human Salmonella infections are reported world wide. This makes Salmonella one of the most important zoonosis. There are over 2,400 different serotypes of Salmonella of which the most important in swine are S. Typhimurium, S. Derby and S. Cholera-suis. About 95% of the Salmonella infections are sub-clinical in swine. Clinical infections are manifested by l...