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Application of the Intelligent High-Throughput Antimicrobial Sensitivity Testing/Phage Screening System and Lar Index of Antimicrobial Resistance
Published on: July 21, 2023
[Surveillance for antimicrobial resistance: VIRA Study]
Juan J Picazo1, Carmen Betriu, Iciar Rodríguez-Avial
1Servicio de Microbiología Clínica. Hospital Clínico San Carlos. Madrid. España.
Introduction:
Resistance to antimicrobial drugs has increased in recent years. The aim of this multicenter study was to determine the current situation in Spain regarding the resistance patterns of the most common infectious agents to antimicrobial drugs.
Material And Methods:
A total 1,475 strains isolated in 38 hospitals in October 2001 were studied. These included 294 methicillin-resistant Staphylococcus aureus (MRSA), 149 clinically significant coagulase-negative staphylococci (CNS), 96 Enterococcus faecium, 1 ampicillin-resistant Enterococcus faecalis, 204 penicillin-resistant Streptococcus pneumoniae, 100 ampicillin-resistant Haemophilus influenzae, 361 ciprofloxacin-resistant Escherichia coli, 160 Pseudomonas aeruginosa, and 110 Acinetobacter baumannii. Sensitivity to various antibiotics was studied by a broth microdilution method. Additionally, an epidemiologic survey was conducted in the participating hospitals to determine the incidence of these multi-drug resistant microorganisms.
Results:
Overall incidence of ciprofloxacin-resistant E. coli and MRSA strains was 24% in both cases. The pneumococci were resistant to several antibiotics. Telithromycin showed excellent activity against all the pneumococci, including those resistant to macrolides. Most MRSA isolates were resistant to quinolones and macrolides. All the staphylococci were susceptible to linezolid and quinupristin-dalfopristin. Only 50% of A. baumannii strains were susceptible to imipenem.
Conclusion:
The results of this study evidence increasing multi-drug resistance among various microorganisms, such as MRSA, CNS, ampicillin-resistant enterococci, and penicillin-resistant pneumococci, and underline the need for surveillance programs to gain information on this significant therapeutic problem.
Insights
Antimicrobial resistance is rising in Spain, with significant rates of ciprofloxacin-resistant E. coli and methicillin-resistant Staphylococcus aureus (MRSA). This highlights the urgent need for ongoing surveillance programs to combat multi-drug resistant organisms.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Antimicrobial drug resistance is a growing global health concern.
- Recent years have seen an increase in drug-resistant infections.
Purpose of the Study:
- To assess the current antimicrobial resistance patterns in Spain.
- To identify the prevalence of resistance in common infectious agents.
Main Methods:
- A multicenter study involving 38 hospitals in Spain.
- Analysis of 1,475 microbial strains, including MRSA, CNS, E. coli, S. pneumoniae, and A. baumannii.
- Broth microdilution method for antibiotic sensitivity testing.
Main Results:
- 24% incidence of ciprofloxacin-resistant E. coli and MRSA.
- Penicillin-resistant Streptococcus pneumoniae showed resistance to multiple antibiotics.
- Telithromycin demonstrated high efficacy against resistant pneumococci.
- All staphylococci were susceptible to linezolid and quinupristin-dalfopristin.
Conclusions:
- Evidence of increasing multi-drug resistance in key pathogens like MRSA and E. coli.
- The study underscores the critical need for robust surveillance programs.
- Monitoring resistance patterns is essential for addressing this therapeutic challenge.
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