1. bookVolume 65 (2015): Issue 4 (December 2015)
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eISSN
1820-7448
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25 Mar 2014
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4 times per year
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English
access type Open Access

Safety Evaluation Of Sjenica Cheese With Regard To Coagulase-Positive Staphylococci And Antibiotic Resistance Of Lactic Acid Bacteria And Staphylococci

Published Online: 22 Dec 2015
Volume & Issue: Volume 65 (2015) - Issue 4 (December 2015)
Page range: 518 - 537
Received: 19 May 2015
Accepted: 26 Oct 2015
Journal Details
License
Format
Journal
eISSN
1820-7448
First Published
25 Mar 2014
Publication timeframe
4 times per year
Languages
English
Abstract

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.

Keywords

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