Related Experiment Video

Updated: Aug 18, 2026

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
11:32

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

Mechanisms of resistance of bacteria causing ventilator-associated pneumonia

Dora Szabo1, Fernanda Silveira, Shigeki Fujitani

  • 1Division of Infectious Diseases, University of Pittsburgh Medical Center, Falk Medical Building, Suite 3A, 3601 5th Avenue, Pittsburgh, PA 15213, USA.

Clinics in Chest Medicine
|April 2, 2005
PubMed

Insights

Common bacteria causing ventilator-associated pneumonia exhibit multi-drug resistance. Mechanisms include altered proteins, ribosomal mutations, and efflux pumps, potentially outpacing new antibiotic development.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Ventilator-associated pneumonia (VAP) is often caused by multidrug-resistant bacteria.
  • Key pathogens include Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae, Enterobacter cloacae, and Acinetobacter spp.

Purpose of the Study:

  • To review the mechanisms of antibiotic resistance in common VAP pathogens.
  • To highlight the challenges posed by emerging resistance patterns.

Main Methods:

  • Literature review of antibiotic resistance mechanisms.
  • Analysis of resistance pathways in Gram-positive and Gram-negative VAP bacteria.

Main Results:

  • Staphylococcus aureus develops resistance via modified penicillin-binding proteins and 23S ribosomal subunit mutations.
  • Gram-negative bacilli utilize beta-lactamase production, efflux pumps, and outer membrane protein loss.
  • Existing antibiotic classes are frequently ineffective against these resistant strains.

Conclusions:

  • Bacterial resistance mechanisms are diverse and evolving.
  • The pace of resistance development may exceed the discovery of new antibiotics.
  • Effective VAP management requires understanding and combating antibiotic resistance.

More Related Videos

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia04:32

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Published on: June 28, 2018

A Non-invasive and Technically Non-intensive Method for Induction and Phenotyping of Experimental Bacterial Pneumonia in Mice07:43

A Non-invasive and Technically Non-intensive Method for Induction and Phenotyping of Experimental Bacterial Pneumonia in Mice

Published on: September 28, 2016

Related Concept Videos

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...
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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...