Safety evaluation of Sjenica cheese with regard to coagulase-positive staphylococci and antibiotic resistance of lactic acid bacteria and staphylococci
| Autor: | Snežana Bulajić, Tijana Ledina, Zora Mijačević, Bojan Golić |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
2. Zero hunger
education.field_of_study antibiotic resistance General Veterinary biology Tetracycline Veterinary medicine Gram-positive bacteria Population Sjenica cheese safety evaluation biology.organism_classification sjenica cheese Microbiology Penicillin lactic acid bacteria Antibiotic resistance Ampicillin SF600-1100 coagulase-positive staphylococci medicine Coagulase education Bacteria medicine.drug |
| Zdroj: | Acta Veterinaria-Beograd Acta Veterinaria, Vol 65, Iss 4, Pp 518-537 (2015) |
| Popis: | Sjenica cheese is an artisanal cheese stored in brine, traditionally produced from raw sheep’s milk in the southern part of Serbia - Sjenica Pester plateau. The aim of this study was to perform the safety evaluation of Sjenica cheese. As one of the safety criteria we considered the number of coagulase positive staphylococci and their enterotoxigenic potential. Antibiotic susceptibility/resistance patterns of autochthonous lactic acid bacteria and coagulase-positive staphylococci isolated from Sjenica cheese was also investigated. During the monitoring period of the cheese-making process, coagulase positive staphylococci did not reach the value of 105 cfu/g. Among coagulase positive staphylococci, 12 (46,15%) isolates showed enterotoxigenic potential and were identified as Staphylococcus intermedius (11 isolates) and Staphylococcus aureus (1 isolate). Vancomycin resistance was the most prevalent phenotypic resistance profile in coagulase positive staphylococci. Lactococci present the most dominant population among lactic acid bacteria. The most prevalent resistance phenotype in lactococci was resistance to streptomycin (83.33%), ampicillin and penicillin (70.83%); lactobacilli were characterized by resistance to vancomycin (62.5%) and tetracycline (54.17%), while resistance to streptomycin (82.46%) was the most prevalent phenotypic profile in enterococci. All coagulase positive staphylococci and lactic acid bacteria isolates that showed resistance to tetracycline on disc diffusion and E-test, were tested for the presence of ribosomal protection proteins, tet(M) and tet(K) genes. All isolates were positive for ribosomal protection proteins genes; 14 (60.87%) isolates showed tet(M) gene presence, while 2 lactobacilli isolates revealed the presence of tet(K) gene. |
| Databáze: | OpenAIRE |
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