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Abstract:
The in vitro activity of apalcillin was tested against 350 clinical isolates of Escherichia coli, Enterobacter, Klebsiella, Proteus, Pseudomonas aeruginosa and Streptococcus faecalis. Using a minimal inhibitory concentration of 16 mg/l as the breakpoint, only 19.7% of the strains were resistant to apalcillin. A regression analysis demonstrated that it is possible to test bacteria for sensitivity with a 20 micrograms apalcillin disc. The results on Mueller-Hinton agar are very similar to those on Iso-Sensitest medium. Like other ureido penicillins, apalcillin is sensitive to most beta-lactamases; it is effective against ampicillin-resistant strains since it penetrates the outer membrane of gram-negative bacteria well and is highly effective against target proteins. Strains producing high amounts of beta-lactamases do become resistant to apalcillin.
Insights
Apalcillin demonstrates significant in vitro activity against common Gram-negative bacteria, with low resistance rates observed. This study confirms apalcillin
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Antibiotic resistance is a growing global health concern, necessitating the development and evaluation of new antimicrobial agents.
- Ureido penicillins represent a class of beta-lactam antibiotics with potential activity against resistant bacterial strains.
- Apalcillin's efficacy against clinically relevant pathogens requires thorough investigation.
Purpose of the Study:
- To evaluate the in vitro antimicrobial activity of apalcillin against a panel of common clinical bacterial isolates.
- To determine the susceptibility of various Gram-negative bacteria, including Escherichia coli, Enterobacter, Klebsiella, Proteus, and Pseudomonas aeruginosa, as well as Streptococcus faecalis, to apalcillin.
- To assess the feasibility of using a standardized apalcillin disc diffusion test for bacterial sensitivity testing.
Main Methods:
- In vitro susceptibility testing of apalcillin against 350 clinical bacterial isolates.
- Determination of minimal inhibitory concentrations (MICs) and calculation of resistance percentages using a breakpoint of 16 mg/l.
- Regression analysis to validate the use of a 20 microgram apalcillin disc for sensitivity testing.
- Comparison of results obtained on Mueller-Hinton agar and Iso-Sensitest medium.
Main Results:
- Apalcillin exhibited low resistance rates, with only 19.7% of tested strains showing resistance at the specified breakpoint.
- A 20 microgram apalcillin disc was found to be a reliable method for assessing bacterial sensitivity.
- Testing results were comparable on both Mueller-Hinton and Iso-Sensitest media.
- Apalcillin effectively penetrates the outer membrane of Gram-negative bacteria and targets essential proteins, showing activity against ampicillin-resistant strains.
Conclusions:
- Apalcillin demonstrates promising in vitro activity against a broad spectrum of common clinical bacterial isolates.
- The antibiotic is effective against ampicillin-resistant strains due to its mechanism of action, but high-level beta-lactamase production can lead to resistance.
- A simple disc diffusion assay can be utilized for routine apalcillin sensitivity testing in clinical laboratories.