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Published on: April 18, 2019
Future trends in the treatment of serious Gram-positive infections
Rosemarie Metzger1, Hugo Bonatti, Robert Sawyer
1Department of Transplantation, University of Virginia, Charlottesville, Virginia 22908-0709, USA.
Abstract:
Gram-positive organisms are the most common bacterial pathogens that cause diseases in humans, with streptococci and staphylococci occurring most frequently. Immunization has been extremely successful in eradicating some Gram-positive infections, such as diphtheria and tetanus, and relatively successful for pneumococci. Staphylococcus aureus vaccines are under investigation. In terms of antimicrobial susceptibility, some Gram-positive organisms have remained sensitive to most antimicrobials, whereas others, including staphylococci, pneumococci and enterococci, have developed clinically relevant resistance. Extensive exposure to antimicrobials in the hospital setting has caused the spread of clones mainly in the hospital environment, yet multiresistance is now also found in community-acquired diseases. Community-acquired methicillin-resistant S. aureus (CA-MRSA) and resistant pneumococci are the most important examples, but even viridans streptococci are becoming resistant to some antibiotics. Moreover, MRSA and vancomycin-resistant enterococci (VRE) are found in pets and farm animals. Because of these concerns, new antimicrobials have been developed during the past decade, including quinupristin/dalfopristin, linezolid, tigecycline, daptomycin and dalbavancin. Also under investigation are beta-lactams, streptogramins and quinolones with activity against MRSA, penicillin-resistant pneumococci and VRE. Finally, infection-control measures, including the identification of carriers of multiresistant organisms and appropriate isolation, must continue to be implemented.
Insights
Gram-positive bacteria, like staphylococci and streptococci, are major human pathogens. Rising antimicrobial resistance necessitates new treatments and strict infection control to combat resistant strains.
Area of Science:
- Microbiology and Infectious Diseases
- Antimicrobial Resistance
- Public Health
Background:
- Gram-positive organisms, particularly streptococci and staphylococci, are leading causes of human bacterial infections.
- While some Gram-positive infections are preventable by vaccines, others like Staphylococcus aureus require ongoing vaccine development.
- Increasing antimicrobial resistance in Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE), poses a significant global health threat.
Purpose of the Study:
- To review the current landscape of Gram-positive bacterial pathogens.
- To highlight the growing challenge of antimicrobial resistance in these organisms.
- To discuss emerging treatment strategies and infection control measures.
Main Methods:
- Literature review of Gram-positive pathogens and antimicrobial resistance trends.
- Analysis of current and investigational antimicrobial agents.
- Examination of infection control strategies for multiresistant organisms.
Main Results:
- Gram-positive bacteria remain significant pathogens, with notable resistance development in staphylococci, pneumococci, and enterococci.
- Multidrug-resistant strains, such as community-acquired MRSA (CA-MRSA) and resistant pneumococci, are increasingly prevalent in both hospital and community settings.
- New antimicrobials and therapeutic agents are under development to address resistant Gram-positive infections, alongside critical infection-control measures.
Conclusions:
- The rise of antimicrobial resistance in Gram-positive bacteria necessitates a multifaceted approach combining novel therapeutics with robust infection control.
- Continued research into vaccines and new antimicrobial agents is crucial for managing infections caused by resistant strains.
- Effective implementation of infection-control measures, including carrier identification and isolation, is essential to limit the spread of multiresistant Gram-positive organisms.
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