Related Experiment Video

Updated: Jul 6, 2026

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing
08:19

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Published on: July 7, 2020

Emergence and spread of antibiotic-resistant Gram-positive bacterial pathogens

Wolfgang Witte1, Christiane Cuny, Ingo Klare

  • 1Robert Koch Institute, Wernigerode Branch, D-38855 Wernigerode, Germany. wittew@rki.de

International Journal of Medical Microbiology : IJMM
|March 8, 2008
PubMed

Insights

Antibiotic resistance in staphylococci, enterococci, and pneumococci is a growing health threat, driven by epidemic clones acquiring resistance genes. Vaccines have helped reduce resistance in some strains like Streptococcus pneumoniae.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Genetics

Background:

  • Multiple antibiotic resistances in staphylococci, enterococci, and pneumococci pose a significant health threat, extending beyond hospital-acquired infections.
  • The development of resistance is primarily linked to the acquisition of resistance genes by dominant epidemic bacterial subpopulations, known as clonal complexes.

Purpose of the Study:

  • To investigate the mechanisms and dissemination patterns of antibiotic resistance in key bacterial pathogens.
  • To understand the role of epidemic clones and mobile genetic elements in the spread of antimicrobial resistance.

Main Methods:

  • Analysis of bacterial population structures and resistance gene acquisition.
  • Epidemiological tracking of specific clones and resistance determinants.
  • Comparative genomics to identify resistance mechanisms and evolutionary pathways.

Main Results:

  • Methicillin-resistant Staphylococcus aureus (MRSA) emergence is linked to specific epidemic clones, though SCCmec element acquisition occurred independently.
  • A single clonal complex in Staphylococcus epidermidis and Enterococcus faecium is widely disseminated in hospitals, acquiring resistance multiple times.
  • Antibiotic resistance in Streptococcus pneumoniae is associated with specific, spreading lineages, with decreased prevalence after the introduction of the 7-valent conjugate vaccine.

Conclusions:

  • Antibiotic resistance development is strongly associated with the clonal spread of specific bacterial lineages.
  • Understanding clonal dynamics and gene acquisition is crucial for combating antimicrobial resistance.
  • Vaccination strategies can impact the prevalence of antibiotic-resistant strains.

More Related Videos

Preparation of Zinc Oxide Nanoparticles and the Evaluation of their Antibacterial Effects06:42

Preparation of Zinc Oxide Nanoparticles and the Evaluation of their Antibacterial Effects

Published on: September 27, 2024

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...
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...
Antibiotic Selection00:57

Antibiotic Selection

Overview
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...
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...
Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...