Objective Aeromonas has recently been recognized as an emerging human pathogen. Aeromonas- associated diarrhea is a phenomenon occurring worldwide. This study was designed to determine the prevalence, genetic diversity, antibiotic resistance, and pathogenicity of Aeromonas strains isolated from food products in Shanghai. Methods Aeromonas isolates (n = 79) collected from food samples were analyzed using concatenated gyrB-cpn60 sequencing. The antibiotic resistance of these isolates was determined using antimicrobial susceptibility testing. Pathogenicity was assessed using β-hemolytic, extracellular protease, virulence gene detection, C. elegans liquid toxicity (LT), and cytotoxicity assays. Results Eight different species were identified among the 79 isolates. The most prevalent Aeromonas species were A. veronii [62 (78.5％)], A. caviae [6 (7.6％)], A. dhakensis [3 (3.8％)], and A. salmonicida [3 (3.8％)]. The Aeromonas isolates were divided into 73 sequence types (STs), of which 65 were novel. The isolates were hemolytic (45.6％) and protease-positive (81.0％). The most prevalent virulence genes were act (73.4％), fla (69.6％), aexT (36.7％), and ascV (30.4％). The results of C. elegans LT and cytotoxicity assays revealed that A. dhakensis and A. hydrophila were more virulent than A. veronii, A. caviae, and A. bivalvium. Antibiotic resistance genes [tetE, blaTEM, tetA, qnrS, aac(6)-Ib, mcr-1, and mcr-3] were detected in the isolates. The multidrug-resistance rate of the Aeromonas isolates was 11.4％, and 93.7％ of the Aeromonas isolates were resistant to cefazolin. Conclusion The taxonomy, antibiotic resistance, and pathogenicity of different Aeromonas species varied. The Aeromonas isolates A. dhakensis and A. hydrophila were highly pathogenic, indicating that food-derived Aeromonas isolates are potential risks for public health and food safety. The monitoring of food quality and safety will result in better prevention and treatment strategies to control diarrhea illnesses in China.

QU Feng Tian;WANG Wen Qing;LIU Qian;ZHOU Hai Jian;HU Jin Rui;DU Xiao Li;WANG Yue;XUE Jia Qi;CUI Zhi Gang;XIE Gui Lin;MENG Shuang

College of Life Science,Northeast Agricultural University,Ha'erbin 150000,Heilongjiang,China;State Key Laboratory of Infectious Disease Prevention and Control,National Institute for Communicable Disease Control and Prevention,Chinese Center for Disease Control and Prevention,Beijing 102206,China;Shanghai Pudong New Area Center for Disease Control and Prevention,Shanghai 200136,China;Laboratory Medicine,Beijing Hospital,National Center of Gerontology;Institute of Geriatric Medicine,Chinese Academy of Medical Sciences, Beijing 100730,China;Clinic Medical College,North China University of Science and Technology,Tangshan 063000,Hebei,China

生物医学与环境科学（英文版）

[1]QU Feng Tian;WANG Wen Qing;LIU Qian;ZHOU Hai Jian;HU Jin Rui;DU Xiao Li;WANG Yue;XUE Jia Qi;CUI Zhi Gang;XIE Gui Lin;MENG Shuang-.Genetic Diversity, Antibiotic Resistance, and Pathogenicity of Aeromonas Species from Food Products in Shanghai, China)[J].生物医学与环境科学（英文版）,2022(09):842-853

caviae,aexT,ascV,bivalvium,tetE,cefazolin

Genetic,Diversity,Antibiotic,Resistance,Pathogenicity,Aeromonas,Species,from,Food,Products,Shanghai,China,Objective,has,recently,been,recognized,emerging,human,associated,diarrhea,phenomenon,occurring,worldwide,This,study,was,designed,prevalence,genetic,diversity,antibiotic,resistance,pathogenicity,strains,isolated,food,products,Methods,isolates,collected,samples,were,analyzed,using,concatenated,gyrB,cpn60,sequencing,these,determined,antimicrobial,susceptibility,testing,assessed,hemolytic,extracellular,protease,virulence,detection,elegans,liquid,LT,cytotoxicity,assays,Results,Eight,different,species,identified,among,most,prevalent,veronii,dhakensis,salmonicida,divided,into,sequence,types,STs,which,novel,positive,genes,act,fla,results,revealed,that,hydrophila,more,virulent,than,blaTEM,tetA,qnrS,aac,Ib,mcr,detected,multidrug,resistant,Conclusion,taxonomy,varied,highly,indicating,derived,are,potential,risks,public,health,safety,monitoring,quality,will,better,prevention,treatment,strategies,control,illnesses

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