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Related Concept Videos

Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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...
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...
Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic01:26

Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic

Healthcare-associated infections (HAIs) occur in a healthcare facility while a person receives care for another ailment. This category also includes work-related infections among healthcare staff.
HAIs significantly increase the cost of health care. Extended stays in healthcare institutions, increased disability, increased costs of medications, including specialized antibiotics, and prolonged recovery times add to the patient's expenses and the healthcare institution and funding bodies. Common...
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...

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Related Experiment Video

Updated: Jul 2, 2026

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
06:37

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source

Published on: February 7, 2013

Staphylococcus aureus bacteraemia with known sources.

Ethan Rubinstein1

  • 1University of Manitoba,Winnipeg, Manitoba, Canada R3E 0W3. erubins@yahoo.com

International Journal of Antimicrobial Agents
|August 22, 2008
PubMed
Summary
This summary is machine-generated.

Meticillin-resistant Staphylococcus aureus (MRSA) infections, including pneumonia and osteomyelitis, are increasing. Early detection of MRSA bacteraemia is crucial for preventing severe complications like epidural abscesses.

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

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Last Updated: Jul 2, 2026

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
06:37

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source

Published on: February 7, 2013

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
07:10

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

Area of Science:

  • Infectious Diseases
  • Clinical Microbiology
  • Public Health

Background:

  • Meticillin-resistant Staphylococcus aureus (MRSA) infections, encompassing hospital-acquired and community-acquired strains (CA-MRSA), have reached epidemic proportions.
  • Staphylococcal infections frequently lead to bacteraemia, presenting diverse clinical manifestations and significant patient risk.

Purpose of the Study:

  • To review clinical forms of staphylococcal infection leading to bacteraemia.
  • To highlight the increasing frequency and clinical impact of MRSA, particularly in pneumonia and osteomyelitis.

Main Methods:

  • Literature review of clinical forms of staphylococcal infection.
  • Analysis of epidemiological trends and clinical outcomes associated with MRSA bacteraemia.

Main Results:

  • Staphylococcal (MRSA) bacteraemic pneumonia occurs in 8.4% of all bacteraemias, 30% of nosocomial bacteraemias, and 68% in ICUs.
  • Community-acquired MRSA (CA-MRSA) pneumonia shows a high bacteraemia rate (62%) with early positive blood cultures.
  • Vertebral and non-vertebral osteomyelitis due to MRSA are increasing, especially in immunocompromised patients.
  • Epidural abscess is a severe complication of staphylococcal bacteraemia, potentially causing neurological damage.

Conclusions:

  • MRSA poses a growing threat, manifesting in severe pneumonia, osteomyelitis, and potentially life-threatening epidural abscesses.
  • Timely diagnosis and intervention are critical for managing MRSA bacteraemia and preventing severe sequelae.