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    Antibiotic resistance and virulence genes in Enterococcus species isolated from raw and processed seafood
    (Springer, 2022) Çardak, Mine; Özmen Toğay, Sine; Ay, Mustafa; Karaalioğlu, Onur; Erol, Özlem; Bağcı, Ufuk
    This study evaluated the antibiotic resistance characteristics and virulence genes of enterococci isolated from raw and processed seafood sold in the Marmara Region, Turkey. In this context, the enterococcal load was determined as between 1.0 and 2.5 log CFU/g in 39 of a total of 397 samples. It was determined that 117 strains isolated from the samples belonged to Enterococcus gallinarum, E. casseliflavus, E. durans, E. faecium, and E. faecalis species. Erythromycin, tetracycline, streptomycin, and gentamicin resistance was observed, whereas the tetM, ermB, aac(6')-aph(2'')-la genes were found in a majority of the isolates. It was also determined that the isolates carried the agg2 and gelE virulence genes. When all these results are evaluated, the presence of these isolates in aquatic products may pose a risk in terms of food safety and public health.
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    Genotypic and Phenotypic Evaluation of Heavy Metal Resistance of Enterococcal Isolates from Seafood Products for Consumption
    (ABADER (Adıyaman Bilimsel Arastırmalar Dernegi), 2023) Çardak, Mine; Özmen Toğay, Sine; Ay, Mustafa
    The aim of this study was to genotypically and phenotypically evaluate the resistance to heavy metal salts of enterococci isolated from fisheries sold in our country's market for food safety. Using concentrations computed as 1000 ppm of seven heavy metal salts, copper (Cu+2), nickel (Ni+2), cadmium (Cd+2), zinc (Zn+2), lead (Pb+2), chromium (Cr+2), and iron (Fe+2) heavy metal resistance (MIK) tests were conducted on each of the enterococci isolates. As a result of the analyses made in this context, resistance to heavy metal salts such as copper, lead, nickel, and cadmium in many isolates and the presence of copper (tcrB) and cadmium (cadA) resistance genes in some isolates were determined. It is considered that the isolates and the fishery products from which these isolates were obtained may carry risks in terms of food safety and public health. In addition, genes encoding heavy metal resistance are also effective in antibiotic resistance. For this reason, it is stated that these microorganisms gain importance not only in applications such as bioremediation and biomining but also in the healthcare sector. © 2023, ABADER (Adıyaman Bilimsel Arastırmalar Dernegi). All rights reserved.