Activity of cefditoren against respiratory pathogens

Catherine L Clark¹, Kensuke Nagai, Bonifacio E Dewasse

¹Departments of Pathology (Clinical Microbiology), Hershey Medical Center, Hershey, PA 17033, USA.

The Journal of Antimicrobial Chemotherapy

|July 4, 2002

Summary

Cefditoren demonstrated superior activity against resistant Streptococcus pneumoniae and Haemophilus influenzae, showing potent bactericidal effects and low resistance development. This cephalosporin offers a promising option for treating challenging bacterial infections.

Area of Science:

Microbiology
Pharmacology
Infectious Diseases

Background:

Antibiotic resistance in Streptococcus pneumoniae and Haemophilus influenzae is a growing public health concern.
Macrolide and quinolone resistance necessitates the evaluation of alternative antibiotic classes.
Cephalosporins remain a cornerstone in treating bacterial infections, requiring ongoing assessment of their efficacy against resistant strains.

Purpose of the Study:

To evaluate the in vitro activity of cefditoren against contemporary clinical isolates of Streptococcus pneumoniae and Haemophilus influenzae.
To compare the bactericidal activity and resistance selection potential of cefditoren with other oral cephalosporins.
To determine the minimum inhibitory concentrations (MICs) and time-kill kinetics of cefditoren against key respiratory pathogens.

Main Methods:

Minimum inhibitory concentration (MIC) testing against 250 Streptococcus pneumoniae and 160 Haemophilus influenzae isolates.
Time-kill studies to assess bactericidal activity at various concentrations.
Multistep and single-step resistance selection studies to evaluate mutant prevention potential.

Main Results:

Cefditoren exhibited the lowest MICs against all tested pneumococcal strains, including penicillin-resistant isolates.
Time-kill studies showed cefditoren achieved rapid and extensive killing of pneumococci and Haemophilus influenzae.
Cefditoren, along with amoxiclav and cefprozil, did not select for resistant mutants, unlike cefuroxime and azithromycin.

Conclusions:

Cefditoren displays potent in vitro activity against drug-resistant Streptococcus pneumoniae and Haemophilus influenzae.
Its bactericidal effect and low propensity to select for resistance make it a valuable therapeutic option.
Cefditoren represents an important advancement in managing infections caused by challenging bacterial pathogens.

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Activity of cefditoren against respiratory pathogens

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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