Why do we need to eradicate pathogens in respiratory tract infections?

Area of Science:

• Infectious Diseases
• Pharmacology
• Microbiology

Background:

• Clinical efficacy of antimicrobials in common infections like otitis media and sinusitis relies on successful bacterial eradication.
• Failure to eradicate pathogens can lead to clinical failure, increased healthcare costs, and the selection of resistant bacteria.
• Previous studies reported treatment failures with macrolides and older fluoroquinolones due to resistant pathogens or suboptimal pharmacokinetics/pharmacodynamics (PK/PD).

Purpose of the Study:

• To highlight the critical role of bacterial eradication in antimicrobial therapy.
• To discuss the consequences of treatment failure, including economic costs and the development of antimicrobial resistance.
• To emphasize the importance of considering PK/PD principles and local epidemiology in antimicrobial selection.

Main Methods:

• Review of evidence from studies on various bacterial infections.
• Analysis of factors contributing to treatment failure and antimicrobial resistance.
• Discussion of the impact of PK/PD on clinical outcomes.

Main Results:

• Bacterial eradication is a key determinant of clinical success in common bacterial infections.
• Inadequate antimicrobial therapy can lead to persistent infections, hospitalization costs, and the emergence of resistant strains.
• Benzylpenicillins and aminopenicillins, at adequate doses, have not been associated with persistent positive blood cultures in reported cases.

Conclusions:

• Effective antimicrobial treatment requires achieving bacterial eradication to prevent clinical failure and resistance.
• Prescribing decisions should integrate accurate diagnosis, local resistance data, PK/PD principles, and an understanding of resistance impact.
• Breaking the cycle of infection and resistance necessitates the use of appropriate antimicrobial strategies focused on eradication.