





摘 要: 以35株生豬屠宰場及養殖場來源的金黃色葡萄球菌分離菌株為試驗材料,分析金黃色葡萄球菌對苯扎溴銨敏感性與生物被膜形成能力的相關性。采用微量肉湯稀釋法檢測金黃色葡萄球菌對苯扎溴銨的敏感性,結晶紫染色法檢測生物被膜形成能力,基于全基因組測序結果分析屠宰環節的26株金黃色葡萄球菌多位點序列分型(multi-locus sequence typing,MLST)情況,以及消毒劑抗性與生物被膜形成相關基因的攜帶情況。結果表明,35株菌中,苯扎溴銨的最小殺菌濃度(minimum bactericidal concentration,MBC)范圍為1 mg·L-1~16 mg·L-1,強成膜能力菌株共16株,占總數的45.71%(16/35),其中93.75%(15/16)來自于屠宰鏈的下游。ST7是強成膜能力菌株的優勢序列型(93.75%,15/16)。金黃色葡萄球菌生物被膜形成能力和苯扎溴銨MBC值呈正相關(相關系數為0.690),而消毒劑抗性與相關基因攜帶情況無關。綜上,金黃色葡萄球菌可通過形成生物被膜提高對消毒劑的耐受性,減弱了苯扎溴銨的消毒效果,增加了養殖和屠宰環節中細菌污染和傳播的風險。
關鍵詞: 金黃色葡萄球菌;生物被膜;苯扎溴銨;相關性
中圖分類號:S852.61
文獻標志碼:A
文章編號:0366-6964(2024)08-3669-09
收稿日期:2023-09-16
基金項目:“十四五”國家重點研發計劃項目(2022YFD1800400)
作者簡介:崔恒潔(1998-),女,湖北荊州人,碩士,主要從事食源性致病菌研究,E-mail: 912761217@qq.com
通信作者:孟憲榮,主要從事獸醫公共衛生和動物性食品安全方向的科研工作,E-mail: xianrongmeng@mail.hzau.edu.cn
Correlation Analysis of Benzalkonium Bromide Sensitivity and Biofilm Formation Ability
in Staphylococcus aureus
CUI" Hengjie1, QIN" Jinlong1, ZHU" Zhihao1, BAO" Xue1, LI" Shaowen1, 2, MENG" Xianrong1, 2*
(1.College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070," China;
2.Key Lab of Preventive Veterinary Medicine in Hubei Province, College of Veterinary Medicine,
Huazhong Agricultural University, Wuhan 430070," China)
Abstract:" Overall 35 strains of Staphylococcus aureus (S. aureus) isolated from one pig slaughterhouse and different pig farms were used as experimental materials to analyze the correlation between the susceptibility of benzalkonium bromide and the biofilm formation ability. Sensitivity to benzalkonium bromide and ability to form biofilms of S. aureus strains were determined using the micro-dilution broth method and the crystal violet staining test, respectively. The multi-locus sequence typing (MLST) and the carrying of genes related to disinfectant resistance and biofilm formation of 26 strains of S. aureus from the slaughterhouse were analyzed based on whole-genome sequences. The results showed that among the 35 strains, the minimum bactericidal concentration (MBC) of benzalkonium bromide ranged from 1 mg·L-1 to 16 mg·L-1, and there were 16 strains with strong biofilm-forming ability, accounting for 45.71% (16/35) of the total, of which 93.75% (15/16) were recovered samples collected from downstream in the slaughter chain. ST7 was the dominant type of S. aureus with strong biofilm-forming ability (93.75%, 15/16). The benzalkonium bromide MBC value of S. aureus was positively correlated with biofilm formation ability (Correlation coefficient=0.690), not withthe disinfectance has nothing to do with the gene. In conclusion, biofilm formation may increase S. aureus resistance to disinfectants, weaken the disinfection effect of benzalkonium bromide, thus enhance the risk of bacterial contamination and transmission in breeding and slaughtering.
Key words: Staphylococcus aureus; biofilm; benzalkonium bromide; correlation
*Corresponding author: MENG Xianrong, E-mail: xianrongmeng@mail.hzau.edu.cn
金黃色葡萄球菌(Staphylococcus aureus, S. aureus)是一種重要的人獸共患病原菌,可通過產生腸毒素導致人食物中毒,我國每年約有20%~25%的細菌性食物中毒病例由S. aureus引起[1]。豬肉是我國第一大肉類消費品,保障豬肉食品安全尤為重要。……