In vitro activity of meropenem against organisms causing serious infections in a Singapore hospital

Area of Science:

• Microbiology
• Infectious Diseases
• Pharmacology

Background:

• Carbapenem antibiotics like meropenem (MEM) are crucial for treating severe bacterial infections.
• Evaluating new antimicrobial agents is essential for combating evolving resistance patterns in hospitals.

Purpose of the Study:

• To assess the efficacy of meropenem against prevalent pathogens causing serious infections within a hospital setting.
• To compare meropenem's activity with existing antimicrobial agents currently in use.

Main Methods:

• Antimicrobial susceptibility testing was performed on 382 bacterial isolates, primarily from blood cultures.
• The Kirby-Bauer disc diffusion method, adhering to the M2-A4 standard, was employed.
• Meropenem was tested alongside 12 agents against Gram-negative bacilli and 7 against staphylococci.

Main Results:

• Meropenem demonstrated significant activity against a broad spectrum of clinically relevant organisms.
• The study identified meropenem, imipenem, and ciprofloxacin as the most potent agents against the tested pathogens.
• Specific attention was given to challenging organisms such as Bacteroides spp. and Burkholderia pseudomallei.

Conclusions:

• Meropenem is a highly effective antibiotic for treating serious infections caused by various hospital-acquired organisms.
• The findings support the inclusion of meropenem in the hospital's antimicrobial formulary for managing severe infections.