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In vitro activity of netilmicin (SCH 20569) against bacterial isolates from ill children
Abstract:
A new aminoglycoside antibiotic, netilmicin, was tested against 306 clinical isolates from ill children and compared with sisomicin and gentamicin. Activity against Enterobacteriaceae was similar to that of gentamicin but less than that of sisomicin. Two gentamicin-resistant strains of Enterobacteriaceae (Klebsiella, MIC 6.25 microgram/ml, Escherichia coli, MIC 12.5 microgram/ml) were susceptible to netilimicin (MIC 3.12 microgram/ml). Netilmicin was ineffective against almost all strains of Pseudomonas but active against the majority of strains of Staphylococcus, Neisseria meningitidis and Haemophilus influenzae tested. Disc diffusion sensitivity results correlated in general with the agar dilution test. Netilmicin had little activity against Pseudomonas but may be useful in the treatment of infections due to gentamicin-resistant Enterobacteriaceae.
Insights
Netilmicin, a new aminoglycoside antibiotic, shows promise against gentamicin-resistant Enterobacteriaceae in pediatric infections. While less effective against Pseudomonas, it demonstrates activity against other key pathogens.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Aminoglycoside antibiotics are crucial for treating bacterial infections.
- Emergence of antibiotic resistance, particularly to gentamicin, necessitates new therapeutic options.
- Netilmicin is a novel aminoglycoside antibiotic with a distinct chemical structure.
Purpose of the Study:
- To evaluate the in vitro activity of netilmicin against clinical isolates from pediatric patients.
- To compare the efficacy of netilmicin with sisomicin and gentamicin.
- To identify potential clinical applications for netilmicin, especially in cases of gentamicin resistance.
Main Methods:
- Agar dilution method was used to determine minimum inhibitory concentrations (MICs).
- Disc diffusion tests were employed to assess antibiotic sensitivity.
- A total of 306 clinical isolates from ill children were tested.
Main Results:
- Netilmicin exhibited activity against Enterobacteriaceae comparable to gentamicin but less than sisomicin.
- Two gentamicin-resistant Enterobacteriaceae strains (Klebsiella and Escherichia coli) were susceptible to netilmicin.
- Netilmicin showed limited activity against Pseudomonas but was effective against Staphylococcus, Neisseria meningitidis, and Haemophilus influenzae.
Conclusions:
- Netilmicin demonstrates potential utility in treating infections caused by gentamicin-resistant Enterobacteriaceae.
- Its activity profile suggests a specific niche in pediatric infectious disease management.
- Further clinical studies are warranted to confirm its therapeutic value.