Comparative in vitro activity of five nitrofurans.

Area of Science:

• Microbiology
• Pharmacology
• Infectious Diseases

Background:

• Nitrofurans are a class of synthetic antimicrobial agents.
• Understanding the in vitro activity spectrum of nitrofurans is crucial for guiding clinical applications.

Purpose of the Study:

• To compare the in vitro antimicrobial activity of five nitrofuran compounds: nitrofurantoin, nifuratel, nitrofurazone, furazolidone, and SQ 18,506.
• To identify the most effective nitrofuran agents against a panel of clinically relevant bacterial and fungal strains.

Main Methods:

• Antimicrobial susceptibility testing was performed on 201 microbial strains.
• The study included Gram-positive bacteria, Gram-negative bacteria, and Candida albicans.
• Minimum inhibitory concentrations (MICs) were implicitly assessed through sensitivity and resistance profiling.

Main Results:

• Escherichia coli, Streptococcus faecalis, micrococci, and Staphylococcus epidermidis were sensitive to all tested nitrofurans.
• Furazolidone and SQ 18,506 exhibited the highest activity against these sensitive species.
• Klebsiella aerogenes showed reduced sensitivity, while Proteus spp., Providencia stuartii, and Pseudomonas aeruginosa were resistant.
• Nifuratel demonstrated inhibitory effects on some Candida albicans strains, with SQ 18,506 being highly active against this fungus.
• Overall, nifuratel displayed superior in vitro antimicrobial properties compared to nitrofurantoin.

Conclusions:

• Nitrofurans exhibit variable in vitro activity against different microbial species.
• Nifuratel and SQ 18,506 show promising broad-spectrum antimicrobial and antifungal activity, respectively.
• Nifuratel is a potent nitrofuran with superior in vitro efficacy over nitrofurantoin for certain applications.