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The aim of the study was to measure the frequency of occurrence of Salmonella spp. in raw milk, to identify  their serotype, as well as to determine their antibiotic resistance and the presence of Salmonella plasmid  virulence (spv) genes. Out of 300 bulk tank milk samples, 5.3% were contaminated with Salmonella spp. All  strains isolated belonged to the serovar S enteritidis, as confirmed by serotyping and molecular methods. The  presence of spv genes was determined by PCR. Spv genes were present, in different patterns, in all strains  tested. SpvA gene was present in all isolates (100%), spvB in 56.25%, spvC in 62.5%, spvD in 75%, and spvR  in 56.25%. Antibiotic resistance was evaluated according to the NCCLS recommendations. All isolates were  sensitive to ciprofloxacin (CIP), gentamicin (GE), and chloramphenicol (CH). Thirteen strains were resistant to  ampicillin (AMP), 8 to erythromycin (E), 1 to doxycycline (DO), and 1 to tetracycline (TE). Different frequency  of occurrence of the spv genes in Salmonella strains isolated from raw milk demonstrates their high adaptability.  As many as 87.5% of isolates showed resistance to at least one of the antibiotics tested....

Determination of the occurrence of plasmid virulence genes (spv) and antibiotic resistance of Salmonella strains isolated from raw milk