Related Experiment Videos
[Impact of bacterial resistance on severe infections]
J Raymond1, M Bergeret, D Gendrel
1Service de microbiologie, hôpital Saint-Vincent-de-Paul, 82, avenue Denfert-Rochereau, 75014 Paris, France. j.raymond@svp.ap-hop-paris.f
Abstract:
Since many years, the antimicrobial resistance increases as well as for community-acquired as for nosocomial infections. Antibiotic-resistant pneumococci are neither more nor less virulent susceptible strains. Except for immunocompromised patients, the outcome of penicillin-resistant pneumococcal infections have been similar to those in patients who are infected by susceptible ones. Current levels of S. pneumoniae resistance to penicillin and cephalosporin are not associated to an increase in mortality in children with meningitis if adequate doses of antibiotics are given. Because empiric therapy has changed, antibiotic resistance has not been associated with increased mortality. This statement can be extended to Meningococcus, for which 32 to 50% of the strains have a decreased susceptibility to penicillin. For nosocomial infections, S. aureus is the main studied pathogen. Several studies report that in patients with severe diseases (bacteremia or pneumonia) methicillin resistance of S. aureus had no significant impact on patient outcome after adjustment for different confounders. The main risk factor for mortality is the severe underlying diseases rather than the resistance as well for methicillin--resistant S. aureus, as for vancomycin resistant enterococci, Klebsiella with extended spectrum beta lactamase and Enterobacters. Recommendations for controlling epidemiologic surveillance, using barrier precautions and limiting the use of antibiotics as well in the hospital as in the community must be undertaken.
Insights
Antimicrobial resistance in common pathogens like Streptococcus pneumoniae and Staphylococcus aureus does not significantly increase mortality. Severe underlying conditions, not antibiotic resistance, are the primary risk factor for patient outcomes.
Area of Science:
- Infectious Diseases
- Microbiology
- Clinical Medicine
Context:
- Increasing antimicrobial resistance is a global concern for both community-acquired and nosocomial infections.
- Pathogens such as Streptococcus pneumoniae, Neisseria meningitidis, and Staphylococcus aureus exhibit resistance to common antibiotics.
Purpose:
- To evaluate the impact of antibiotic resistance on patient mortality and outcomes.
- To determine if resistant strains of key pathogens are associated with increased mortality compared to susceptible strains.
Summary:
- Penicillin-resistant Streptococcus pneumoniae and cephalosporin resistance do not increase mortality in pediatric meningitis when adequate antibiotic doses are administered.
- Methicillin-resistant Staphylococcus aureus (MRSA) in severe nosocomial infections (bacteremia, pneumonia) shows no significant impact on patient outcomes after adjusting for confounders.
- Severe underlying diseases are the main risk factor for mortality in infections caused by resistant pathogens, including MRSA, vancomycin-resistant enterococci, and extended-spectrum beta-lactamase-producing Klebsiella.
Impact:
- Current antibiotic resistance levels, particularly for S. pneumoniae and S. aureus, are not directly linked to increased mortality in many clinical scenarios.
- Highlights the critical role of managing underlying patient conditions over solely focusing on antibiotic resistance in treatment strategies.
- Emphasizes the need for robust epidemiologic surveillance, barrier precautions, and judicious antibiotic use in both hospital and community settings to control resistance spread.