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<p>Non-aureus staphylococci (NAS), once regarded as less pathogenic than <i>Staphylococcus aureus</i>, are now recognized as emerging opportunistic pathogens in both animals and humans. Species such as <i>S. sciuri</i>,<i> S. chromogenes</i>, and <i>S. xylosus</i> are linked to subclinical mastitis, wound infections, and other animal diseases, posing risks to food safety and public health due to the transfer of resistance genes to <i>S. aureus</i> or other bacterial species. This study investigated the prevalence, antimicrobial resistance, and <i>mecA</i> gene of NAS isolated from four districts of Bangladesh. From 180 samples, NAS were isolated using selective media and identified via the VITEK-2 system. Antimicrobial susceptibility was tested by the disc diffusion method following CLSI guidelines, and the <i>mecA</i> gene was detected by PCR. Among six identified species, <i>S. sciuri</i> (4.44%) and <i>S. chromogenes</i> (2.78%) were predominant. Over half of the isolates (51.85%) were multidrug-resistant, with the highest prevalence in Dhaka, while 18.5% carried the <i>mecA</i> gene. These findings demonstrate that NAS, particularly <i>S. sciuri</i> and <i>S. chromogenes</i>, act as significant reservoirs of multidrug and methicillin resistance. These findings highlight the need to integrate NAS into AMR surveillance and emphasize the importance of antimicrobial stewardship, continuous monitoring, and improved biosecurity to reduce public health risks.</p>

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Antimicrobial resistance profiles of non-aureus Staphylococci isolated from farm animals, farm environments and companion animals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月16日

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  • Md Hafizur Rahman,
  • Md. Niamul Shahadat,
  • Abu Bakkar Siddique,
  • Shihab Ahmed

摘要

Non-aureus staphylococci (NAS), once regarded as less pathogenic than Staphylococcus aureus, are now recognized as emerging opportunistic pathogens in both animals and humans. Species such as S. sciuri, S. chromogenes, and S. xylosus are linked to subclinical mastitis, wound infections, and other animal diseases, posing risks to food safety and public health due to the transfer of resistance genes to S. aureus or other bacterial species. This study investigated the prevalence, antimicrobial resistance, and mecA gene of NAS isolated from four districts of Bangladesh. From 180 samples, NAS were isolated using selective media and identified via the VITEK-2 system. Antimicrobial susceptibility was tested by the disc diffusion method following CLSI guidelines, and the mecA gene was detected by PCR. Among six identified species, S. sciuri (4.44%) and S. chromogenes (2.78%) were predominant. Over half of the isolates (51.85%) were multidrug-resistant, with the highest prevalence in Dhaka, while 18.5% carried the mecA gene. These findings demonstrate that NAS, particularly S. sciuri and S. chromogenes, act as significant reservoirs of multidrug and methicillin resistance. These findings highlight the need to integrate NAS into AMR surveillance and emphasize the importance of antimicrobial stewardship, continuous monitoring, and improved biosecurity to reduce public health risks.