[Macrolide-resistant Mycoplasma pneumoniae]

Miyuki Morozumi1, Kimiko Ubukata

  • 1Laboratory of Molecular Epidemiology for Infectious Agents, Kitasato Institute for Life Sciences, Kitasato University.

Insights

Macrolide-resistant Mycoplasma pneumoniae causes prolonged fever in pediatric community-acquired pneumonia (CAP). This resistance, linked to a specific gene mutation, necessitates alternative antibiotic treatments beyond macrolides.

Area of Science:

  • Pediatric infectious diseases
  • Microbiology
  • Antimicrobial resistance

Context:

  • Mycoplasma pneumoniae is a primary cause of community-acquired pneumonia (CAP) in children.
  • Macrolide-resistant M. pn emerged in Japan in 2000 and has since increased.
  • ML resistance in M. pn is associated with a point mutation in domain V of the 23S rRNA gene.

Purpose:

  • To investigate the clinical implications of macrolide-resistant Mycoplasma pneumoniae infections in pediatric CAP.
  • To highlight the challenges in treating M. pn infections due to emerging antimicrobial resistance.

Summary:

  • Macrolide-resistant M. pn strains, identified by a specific rRNA mutation, are increasingly prevalent in pediatric CAP cases.
  • Patients with ML-resistant M. pn experienced significantly longer fever duration compared to those with susceptible strains.
  • Treatment often required switching from macrolides to alternative antibiotics like minocycline or levofloxacin due to persistent symptoms.

Impact:

  • The study underscores the growing threat of antimicrobial resistance in pediatric respiratory infections.
  • Findings indicate a need for updated treatment guidelines and further research into effective chemotherapy for resistant M. pn infections.

Related Concept Videos

Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
Mechanism of Antibiotic Resistance in MRSA01:25

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...
Clinical Significance of Antibiotic Resistance01:25

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...
Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...