[In vitro studies with piperacillin. Effectiveness against enterobacteriaceae and pseudomonas aeruginosa compared to other antibiotics (author's transl)]

Area of Science:

• Microbiology
• Pharmacology
• Infectious Diseases

Background:

• Broad-spectrum penicillins and cephalosporins are crucial in combating gram-negative bacterial infections.
• Emerging bacterial resistance necessitates the evaluation of novel antimicrobial agents.
• Understanding the in vitro efficacy of new antibiotics is vital for clinical application.

Purpose of the Study:

• To compare the in vitro antibacterial activity of piperacillin with existing broad-spectrum penicillins and beta-lactamase stable cephalosporins.
• To assess the efficacy of piperacillin against a large collection of gram-negative bacterial strains.
• To identify potential resistance patterns of gram-negative bacteria to piperacillin.

Main Methods:

• Agar diffusion test was employed for in vitro susceptibility testing.
• A total of 1699 gram-negative bacterial strains were utilized in the study.
• Piperacillin was tested against other broad-spectrum penicillins and cephalosporins.

Main Results:

• Piperacillin exhibited generally superior antibacterial activity compared to other tested penicillins.
• Less than 1% of Pseudomonas aeruginosa strains showed resistance to piperacillin.
• Klebsiella spp. demonstrated higher sensitivity to cefoxitin and cefuroxime than to piperacillin.

Conclusions:

• Piperacillin presents a promising option for treating gram-negative bacterial infections due to its broad spectrum and high in vitro activity.
• The low resistance rate in Pseudomonas aeruginosa highlights piperacillin's potential effectiveness against this challenging pathogen.
• While highly effective, specific gram-negative bacteria like Klebsiella may exhibit better responses to certain cephalosporins, guiding therapeutic choices.