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Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
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Related Experiment Video

Updated: May 18, 2026

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
14:04

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Published on: May 8, 2013

Methicillin-resistant and methicillin-sensitive Staphylococcus aureus laryngitis.

Manish D Shah1, Adam M Klein

  • 1Department of Otolaryngology-Head and Neck Surgery, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

The Laryngoscope
|September 12, 2012
PubMed
Summary

Methicillin-resistant Staphylococcus aureus (MRSA) laryngitis may be more common and subtle than previously thought. In-office laryngeal cultures aid diagnosis, with trimethoprim-sulfamethoxazole showing effectiveness in treatment.

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

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Area of Science:

  • Otolaryngology
  • Infectious Diseases
  • Microbiology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) infections are prevalent in head and neck regions.
  • MRSA laryngitis cases are rarely reported, suggesting underdiagnosis.

Purpose of the Study:

  • To describe the clinical presentation, diagnosis, treatment, and outcomes of MRSA and methicillin-sensitive S aureus (MSSA) laryngitis.
  • To highlight the utility of in-office laryngeal workup for these conditions.

Main Methods:

  • Retrospective case series of patients treated at Emory Voice Center (2007-2011).
  • Inclusion of patients with culture-proven S aureus laryngitis (MRSA and MSSA).
  • Data collection included demographics, diagnosis, and treatment from medical records.

Main Results:

  • Three MRSA and three MSSA laryngitis cases identified; patients aged 34-74.
  • Common symptoms: vocal roughness, fatigue, decreased endurance; no airway compromise.
  • In-office laryngeal cultures confirmed diagnosis; trimethoprim-sulfamethoxazole treatment was effective, often requiring multiple courses.

Conclusions:

  • This series is the largest for MRSA laryngitis, indicating it may be more common than recognized.
  • Signs and symptoms of MRSA laryngitis are subtle and similar to MSSA.
  • High clinical suspicion and in-office laryngeal cultures are crucial for diagnosis.