The invention relates to a diagnostic method to detect a salmonellae infection and/or salmonellae contamination. Fields of use include medicine, veterinary medicine and various branches of industry.The goal of the invention is to develop a reliable test to identify salmonellae. It is based on the task of designing a method that allows the earliest possible identification and covers all important serovars.The diagnostic method to detect a salmonellae infection/contamination in accordance with the invention is characterised in that the SipC of all known salmonellae serovars excreted by the salmonellae can be identified in excretions of patients/animals, carcasses, eggs and food/animal feed. This identification is carried out by means of immunochemical systems using mono- and polyclonal antibodies that are directed against the following peptide sequences: (SEQ ID NO 1) NH2-V-A-S-T-A-S-D-E-A-R-E-S-S-R-K-S-COOH, (SEQ ID NO 2) NH2-N-N-H-S-V-E-N-S-S-Q-T-A-S-Q-S-V-COOH, (SEQ ID NO 3) NH2-G-Q-Y-A-A-T-Q-E-R-S-E-Q-Q-I-S-COOH, (SEQ ID NO 4) NH2-L-G-I-K-D-S-N-K-Q-I-S-P-E-H-COOH and (SEQ ID NO 5) NH2-L-N-M-K-K-T-G-T-D-A-T-K-N-L-N-COOH.