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<p><i>Vibrio vulnificus</i> is a halophilic marine bacterium and a significant cause of seafood-borne infections in humans, particularly in tropical and subtropical regions. The present study aimed to assess the prevalence, virulence potential, and antibiotic resistance of <i>V. vulnificus</i> in seafood samples collected from different landing centres along the Nagapattinam coast, Tamil Nadu, India. A total of 415 seafood samples were screened, including 308 finfish, 65 bivalves, and 42 crustaceans. From these, 209 presumptive isolates were obtained, of which 192 (91.87%) were confirmed as <i>V. vulnificus</i> through <i>gyrB</i>-based PCR. Among the <i>gyrB</i>-positive isolates, 89.06% carried the hemolysin gene (<i>vvhA</i>), and 78.13% carried the repeat-in-toxin gene (<i>rtxA1</i>). Further genotyping revealed that 31.58% of the isolates were clinical-type (P1 &amp; P3-positive) and 60.29% were environmental-type (P2 &amp; P3-positive), indicating the coexistence of both pathogenic and non-pathogenic strains in seafood. The recovery rate of <i>V. vulnificus</i> was highest from Modified Cellobiose Polymyxin and Colistin (mCPC) agar, confirming its superiority among the selective media tested. Antimicrobial susceptibility testing showed high resistance to ampicillin (88.02%), with moderate resistance to chloramphenicol, streptomycin, and tetracycline. These findings highlight the potential health risks posed by seafood-borne <i>V. vulnificus</i> in the region and emphasize the need for routine surveillance and seafood safety management strategies. Clinical trial number: not applicable.</p> Graphical Abstract <p></p>

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Assessment of Pathogenic Vibrio vulnificus Risk in Finfish and Shellfish Landed in Different Landing Centres of South East Coast of Tamil Nadu, India

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Venkatesan Alamelu,
  • Shanmugam Sudarshan,
  • Pandiyan Praveenkumar,
  • Subbiah Balasundari,
  • Sekar Vimaladevi

摘要

Vibrio vulnificus is a halophilic marine bacterium and a significant cause of seafood-borne infections in humans, particularly in tropical and subtropical regions. The present study aimed to assess the prevalence, virulence potential, and antibiotic resistance of V. vulnificus in seafood samples collected from different landing centres along the Nagapattinam coast, Tamil Nadu, India. A total of 415 seafood samples were screened, including 308 finfish, 65 bivalves, and 42 crustaceans. From these, 209 presumptive isolates were obtained, of which 192 (91.87%) were confirmed as V. vulnificus through gyrB-based PCR. Among the gyrB-positive isolates, 89.06% carried the hemolysin gene (vvhA), and 78.13% carried the repeat-in-toxin gene (rtxA1). Further genotyping revealed that 31.58% of the isolates were clinical-type (P1 & P3-positive) and 60.29% were environmental-type (P2 & P3-positive), indicating the coexistence of both pathogenic and non-pathogenic strains in seafood. The recovery rate of V. vulnificus was highest from Modified Cellobiose Polymyxin and Colistin (mCPC) agar, confirming its superiority among the selective media tested. Antimicrobial susceptibility testing showed high resistance to ampicillin (88.02%), with moderate resistance to chloramphenicol, streptomycin, and tetracycline. These findings highlight the potential health risks posed by seafood-borne V. vulnificus in the region and emphasize the need for routine surveillance and seafood safety management strategies. Clinical trial number: not applicable.

Graphical Abstract