Salmonella from animal feed: biofilm forming abilities and antimicrobial susceptibility
2012
Milanov, Dubravka (Scientific Veterinary Institute, Novi Sad (Serbia)) | Stojanović, Dragica (Scientific Veterinary Institute Novi Sad, Novi Sad (Serbia)) | Prunić, Bojana (Scientific Veterinary Institute Novi Sad, Novi Sad (Serbia)) | Čabarkapa, Ivana (Institute of Food Technology, Novi Sad (Serbia)) | Suvajdžić, Ljiljana (Faculty of Medicine, Novi Sad (Serbia). Department of Pharmacy)
Animal feed is frequently contaminated with different serotypes of Salmonella that can lead to infection or colonisation of animals used for food and to subsequently provoke the infection in the consumers. Sometimes, though rarely established, feed contamination with Salmonella strains resistant against antimicrobial agents of clinical relevance is possible. Feed factory environment is one of potential sources of cross-contamination and recontamination of end-products with Salmonella. It is well known that some strains may persist on feed production sites for years. Such strains are commonly identified as „house-strain―. It is hypothesized that their persistence is greatly enhanced by their ability to form biofilm on diverse abiotic surfaces. In biofilm, the bacteria manifest an increased resistance to disinfection and other stress factors commonly present on feed production sites. The aim of this study was to investigate the ability of biofilm formation and antimicrobial susceptibility of 30 Salmonella strains isolated from feed in the period January-March 2012. Confirmation and serotyping of Salmonella was performed in the National Reference Laboratory. The ability of biofilm forming was examined using polystyrene (microtiter plate assay), and isolates susceptibility to various antibiotic groups by the standard disc diffusion test. The obtained results confirmed ability of biofilm formation in different Salmonella strains isolated from feed. This suggests that biofilm can provide persistence of particular strains in feed factory environment. Because of susceptibility of all isolates towards main groups of antibiotics, feed was not identified as an important vector for resistant Salmonella strains.
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