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<p>This study aimed to assess the prevalence of antimicrobial resistant bacteria in <i>Penaeus vannamei</i> shrimps from brackish water-cultured farms in Nagapattinam. Among the isolated bacteria, 90.11% exhibited a multiple antibiotic resistance (MAR) index over 0.2, indicating excessive antibiotic exposure in farming systems. Significant bacterial isolates identified included <i>Vibrio parahemolyticus</i>,<i> Escherichia coli</i>, and <i>Aeromonas hydrophila</i>, with <i>Escherichia coli</i> exhibiting the highest resistance index (0.72), followed by <i>Vibrio parahemolyticus</i> (0.46) and <i>Aeromonas hydrophila</i> (0.32). Examination of 30 antibiotics across 10 classes highlighted beta-lactams (46%), tetracyclines (14%), and nitrofurans (10%) as the most resistant. Within beta-lactam resistance, ampicillin resistance prevailed (88%, <i>n</i> = 80/91), followed by methicillin (85%, <i>n</i> = 77/91), aztreonam (68%, <i>n</i> = 62/91), and penicillin (60%, <i>n</i> = 55/91). PCR analysis uncovered the presence of the <i>blaSHV</i> and <i>blaTEM</i> genes, responsible for ampicillin resistance in 90.4% of isolates, including those resistant to multiple beta-lactam antibiotics. Region wise differences in resistance patterns were observed among the selected sites in Nagapattinam district. Notably, there is a rise in resistance to commonly employed antimicrobials within the shrimp farming sector, posing a potential threat to both human health and the environment—a concern encompassing the One Health approach. The availability of such regional antimicrobial susceptibility data is indispensable for shaping guidelines governing the judicious use of antimicrobials in sustainable shrimp farming practices.</p>

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Assessment of Multi-Drug-Resistant Bacterial Phenotypes in Penaeus vannamei from Brackish Water Shrimp Farms in Nagapattinam, South India

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Abisha Juliet Mary S. J.,
  • Petchimuthu M.,
  • Deepika S.,
  • Ferolin Jessina G.,
  • Balasundari S.

摘要

This study aimed to assess the prevalence of antimicrobial resistant bacteria in Penaeus vannamei shrimps from brackish water-cultured farms in Nagapattinam. Among the isolated bacteria, 90.11% exhibited a multiple antibiotic resistance (MAR) index over 0.2, indicating excessive antibiotic exposure in farming systems. Significant bacterial isolates identified included Vibrio parahemolyticus, Escherichia coli, and Aeromonas hydrophila, with Escherichia coli exhibiting the highest resistance index (0.72), followed by Vibrio parahemolyticus (0.46) and Aeromonas hydrophila (0.32). Examination of 30 antibiotics across 10 classes highlighted beta-lactams (46%), tetracyclines (14%), and nitrofurans (10%) as the most resistant. Within beta-lactam resistance, ampicillin resistance prevailed (88%, n = 80/91), followed by methicillin (85%, n = 77/91), aztreonam (68%, n = 62/91), and penicillin (60%, n = 55/91). PCR analysis uncovered the presence of the blaSHV and blaTEM genes, responsible for ampicillin resistance in 90.4% of isolates, including those resistant to multiple beta-lactam antibiotics. Region wise differences in resistance patterns were observed among the selected sites in Nagapattinam district. Notably, there is a rise in resistance to commonly employed antimicrobials within the shrimp farming sector, posing a potential threat to both human health and the environment—a concern encompassing the One Health approach. The availability of such regional antimicrobial susceptibility data is indispensable for shaping guidelines governing the judicious use of antimicrobials in sustainable shrimp farming practices.