Genomic Insights into Methicillin-Resistant Staphylococci and Mammaliicocci from Bulk Tank Milk of Dairy Farms in Serbia.

The potential risk to human and animal health provides a rationale for research on methicillin-resistant staphylococci (MRS) and mammaliicocci (MRM) in dairy herds. Here, we aimed to estimate their occurrence in the bulk tank milk (BTM) samples collected in 2019-2021 from 283 bovine dairy farms in the Belgrade district. We used whole-genome sequencing to characterize the obtained isolates and assess their genetic relatedness.

Safety evaluation of enterococci isolated from raw milk and artisanal cheeses made in Slovenia and Serbia.

Enterococci represent a significant part of the non-starter LAB microbiota of artisanal cheeses produced mainly from raw milk. Common approaches to safety evaluation of enterococci isolates include assessment of antimicrobial resistance and virulence potential. Hence, a collection of 47 (n = 22, Serbia; n = 25, Slovenia) dairy enterococcal isolates, of which (n = 28), (n = 11), (n = 5), (n = 2), and (n = 1), was analyzed.

Tetracycline resistance in lactobacilli isolated from Serbian traditional raw milk cheeses.

The aim of this study was to investigate the presence of tetracycline resistance in lactobacilli isolated from traditional Serbian white brined raw milk cheeses (Homolje, Sjenica, Zlatar). Isolation of presumptive lactobacilli was initially performed using MRS-S agar without tetracycline, or supplemented with 16 and 64 µg/mL of tetracycline. Rep-PCR (GTG) genotyping showed a high diversity of the isolates obtained, as examination of 233 isolates resulted in 156 different Rep-PCR fingerprints.

Enterotoxin production and antimicrobial susceptibility in Staphylococci isolated from traditional raw milk cheeses in Serbia.

This study was undertaken to determine the prevalence of coagulase positive staphylococci (CPS) by examining a total of 71 raw milk cheeses. Additionally, enterotoxigenicity, antimicrobial susceptibility and the presence of mecA and mecC genes in the staphylococcal isolates were investigated. The isolation and enumeration procedure of CPS followed the International Organization for Standardization (ISO) standard.