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Background  Solely in Europoe,  Salmonella  Typhimurium causes more than 100,000 infections per year. Improved detection of livestock colonised with  S.  Typhimurium is necessary to prevent foodborne diseases. Currently, commercially available ELISA assays are based on a mixture of O-antigens (LPS) or total cell lysate of  Salmonella  and are hampered by cross-reaction. The identification of novel immunogenic proteins would be useful to develop ELISA based diagnostic assays with a higher specificity.    Results  A phage display library of the entire  Salmonella  Typhimurium genome was constructed and 47 immunogenic oligopeptides were identified using a pool of convalescent sera from pigs infected with  Salmonella  Typhimurium. The corresponding complete genes of seven of the identified oligopeptids were cloned. Five of them were produced in  E. coli . The immunogenic character of these antigens was validated with sera from pigs infeced with  S.  Tyhimurium and control sera from non-infected animals. Finally, human antibody fragments (scFv) against these five antigens were selected using antibody phage display and characterised.    Conclusion  In this work, we identified novel immunogenic proteins of  Salmonella  Typhimurium and generated antibody fragments against these antigens completely based on phage display. Five immunogenic proteins were validated using a panel of positive and negative sera for prospective applications in diagnostics of  Salmonela  Typhimurium.

Identification of immunogenic proteins and generation of antibodies against SalmonellaTyphimurium using phage display