The invention relates to the field of microbiology, specifically to a bacteriophage, polypeptide and a corresponding polynucleotide, a nucleic acid molecule and/or vector and/or cell comprising such polynucleotide, a composition comprising said bacteriophage, polypeptide, polynucleotide, construct, vector and/or cell, preferably for preventing, treating or diagnosing contamination with and/or a condition in an individual related to Salmonella. The invention further relates to an antimicrobial composition for medical use or for use as a food additive or as a disinfectant, or for detecting bacteria, preferably in a diagnostic application, wherein said antimicrobial composition comprises a bacteriophage, polypeptide, corresponding polynucleotide, construct and/or vector and/or cell comprising such polypeptide and/or composition according to the present invention.