Chajęcka-Wierzchowska Wioleta, Gajewska Joanna, Zadernowska Anna, Randazzo Cinzia Lucia, Caggia Cinzia
Department of Industrial and Food Microbiology, University of Warmia and Mazury in Olsztyn, Plac Cieszyński 1, 10-726 Olsztyn, Poland.
Department of Agriculture, Food and Environment (Di3A), Via Santa Sofia 100, University of Catania, 95123 Catania, Italy.
Foods. 2023 Jan 23;12(3):514. doi: 10.3390/foods12030514.
The present study aimed to characterize and assess the diversity of CoNS strains as potential vectors for the spread of resistance to antimicrobial agents from RTE foods served in bars and restaurants. Eighty-five CoNS strains, obtained from 198 RTE food samples, were investigated. Sixty-seven CoNS isolates (78.8%) were resistant to at least one antibiotic tested, and 37 (43.5%) were multidrug resistant (MDR-CoNS). Moreover, CoNS strains contained genes conferring resistance to antibiotics critically important in medicine, i.e., β-lactams [ (29.4%); (84.7%)], aminoglycosides [ (45.9%); (3.5%)], macrolides, lincosamides and streptogramin B-MLS [ (68.2%); (40%) and (4.7%)], tetracyclines [ (31.8%); (16.5%) and/or (2.35%)]. We also found the B/C/D genes responsible for the acquired low-level fusidic acid resistance (17.6%) and streptogramin resistance determinant in 30.6% of isolates. In three linezolid resistant strains (2 and 1 ), mutation was detected, as demonstrated by L101V and V188I changes in the L3 protein amino acid sequences. The high frequency in RTE food of MDR-CoNS including methicillin-resistant (MR-CoNS) strains constitutes a direct risk to public health as they increase the gene pool from which pathogenic bacteria can pick up resistance traits.
本研究旨在鉴定和评估凝固酶阴性葡萄球菌(CoNS)菌株的多样性,这些菌株可能是酒吧和餐馆提供的即食食品(RTE)中抗菌药物耐药性传播的潜在载体。对从198份RTE食品样本中分离出的85株CoNS菌株进行了研究。67株CoNS分离株(78.8%)对至少一种测试抗生素耐药,37株(43.5%)为多重耐药(MDR-CoNS)。此外,CoNS菌株含有对医学上至关重要的抗生素具有耐药性的基因,即β-内酰胺类[(29.4%);(84.7%)]、氨基糖苷类[(45.9%);(3.5%)]、大环内酯类、林可酰胺类和链阳菌素B-MLS[(68.2%);(40%)和(4.7%)]、四环素类[(31.8%);(16.5%)和/或(2.35%)]。我们还发现了导致获得性低水平夫西地酸耐药性的B/C/D基因(17.6%)以及30.6%的分离株中存在链阳菌素耐药决定簇。在三株耐利奈唑胺菌株(2株和1株)中检测到了突变,L3蛋白氨基酸序列中的L101V和V188I变化证明了这一点。包括耐甲氧西林(MR-CoNS)菌株在内的MDR-CoNS在RTE食品中的高频率存在对公众健康构成直接风险,因为它们增加了致病细菌可以获取耐药性状的基因库。