Open Access
Research (Published online: 18-01-2022)
8. Emergence of extensively drug-resistant Aeromonas hydrophila complex isolated from wild Mugil cephalus (striped mullet) and Mediterranean seawater
Hamza Mohamed Eid, Heba Sayed El-Mahallawy, Amany Mahmoud Shalaby, Hassnaa Mahmoud Elsheshtawy, Mera Mohamed Shetewy and Nada Hussein Eidaroos
Veterinary World, 15(1): 55-64

Hamza Mohamed Eid: Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt.
Heba Sayed El-Mahallawy: Department of Animal Hygiene, Zoonoses, and Animal Behaviour and Management, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt.
Amany Mahmoud Shalaby: Department of Food Hygiene, Animal Health Research Institute, Port Said Branch, Port Said, Egypt.
Hassnaa Mahmoud Elsheshtawy: Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt.
Mera Mohamed Shetewy: Veterinarian, Port Said, Egypt.
Nada Hussein Eidaroos: Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt.

doi: www.doi.org/10.14202/vetworld.2022.55-64

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Article history: Received: 23-09-2021, Accepted: 14-12-2021, Published online: 18-01-2022

Corresponding author: Heba Sayed El-Mahallawy

E-mail: dr_ba1012_2@hotmail.com

Citation: Eid HM, El-Mahallawy HS, Shalaby AM, Elsheshtawy HM, Shetewy MM, Eidaroos NH (2022) Emergence of extensively drug-resistant Aeromonas hydrophila complex isolated from wild Mugil cephalus (stripped mullet) and Mediterranean seawater, Veterinary World, 15(1): 55-64.
Abstract

Background and Aim: Antibiotic resistance has been a progressively documented problem, resulting in treatment failure in humans and animals. This study aimed to investigate the antimicrobial susceptibility and virulence of extensively drug-resistant (XDR) Aeromonas spp. in wild Mugil cephalus and its surrounding seawater along the coastal road of Port Said, Egypt.

Materials and Methods: Specimens were examined bacteriologically, confirmed biochemically, and tested for their sensitivity against 11 antimicrobial agents. Molecular confirmation of the obtained isolates by 16S rRNA was performed, followed by the detection of antimicrobial resistance and virulence genes.

Results: Aeromonas spp. was recovered from fish (44%) and water samples (36%). A. hydrophila was the most prevalent identified strain, followed by Aeromonas sobria, Aeromonas caviae, and Aeromonas schubertii. Moreover, 90% of the tested isolates were multidrug-resistant (MDR), while 26.67% were XDR. Tested isolates were resistant to β-lactams and sulfonamides (100%), oxytetracycline (90%), and streptomycin (62.22%) but completely susceptible to cefotaxime. XDR isolates successfully amplified resistance genes (blaTEM, sul1, and tetA(A)) but not the (aadA1) gene, although there was phenotypic resistance to streptomycin on plates. All XDR isolates carry the cytotoxic enterotoxin gene (act), but alt gene was detected in only one isolate (12.5%).

Conclusion: Data in this study provide a recent update and highlight the role of wild mullet and seawater as reservoirs for MDR and XDR Aeromonas spp. that may pose a risk to humans as food-borne infection or following direct contact.

Keywords: Aeromonas hydrophila complex, antimicrobial resistance, Mugil cephalus, resistance genes, Seawater, virulence genes.