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Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
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Updated: Jun 6, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Methicillin-resistant Staphylococcus aureus in animals.

J Scott Weese1

  • 1Department of Pathobiology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. jsweese@uoguelph.ca

ILAR Journal
|December 7, 2010
PubMed
Summary
This summary is machine-generated.

Methicillin-resistant Staphylococcus aureus (MRSA) is a growing concern in both human and animal health. Animals, including pets and livestock, can carry and transmit MRSA, impacting public health.

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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
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Last Updated: Jun 6, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
07:46

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Area of Science:

  • Veterinary Medicine
  • Public Health
  • Infectious Diseases

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen in humans and an emerging threat in animals.
  • MRSA is found in diverse animal species, acting as both a cause of infection and a carrier state.
  • The presence of MRSA in animals and food raises concerns about zoonotic transmission and its role in human infections.

Purpose of the Study:

  • To review the current understanding of MRSA in human medicine, veterinary medicine, and food.
  • To discuss the interspecies transmission, colonization, and infection dynamics of MRSA.
  • To highlight knowledge gaps and the need for further research into MRSA's scope and impact.

Main Methods:

  • Literature review and synthesis of existing studies on MRSA in humans and animals.
  • Analysis of MRSA epidemiology, strains, and affected populations.
  • Discussion of the interspecies transmission pathways and public health implications.

Main Results:

  • MRSA circulates across various animal species, with evidence of transmission between animals and humans.
  • Food animals and pets can act as reservoirs and sources of human MRSA infections.
  • Individuals with close animal contact, like veterinarians, show higher colonization rates.

Conclusions:

  • Animals are confirmed sources of human MRSA infections in certain scenarios, and humans can also infect animals.
  • Epidemiological changes in MRSA within one species can influence other species.
  • The full extent of MRSA in animals and its public health impact are not yet fully understood, necessitating further investigation.