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Resistant respiratory pathogens and extended-spectrum antibiotics
1Department of Microbiology and Immunology, University of Rochester Medical Center, NY 14642, USA.
Abstract:
Traditional antibiotics such as amoxicillin, tetracycline and erythromycin remain the drugs of first choice for most bacterial respiratory infections. However, the usefulness of these agents varies, depending on local bacterial resistance patterns and patient factors. In the United States, amoxicillin and penicillin resistance currently occurs in 20 to 30 percent of Streptococcus pneumoniae strains, 30 to 40 percent of Haemophilus influenzae strains and 70 to 90 percent of Moraxella catarrhalis strains. For infections with these pathogens, selective use of the newer extended-spectrum oral antibiotics may be indicated. Cefuroxime axetil (a second-generation cephalosporin), cefpodoxime (a third-generation cephalosporin), amoxicillin-clavulanate (a beta-lactamase inhibitor combination agent) and clarithromycin or azithromycin (extended-spectrum macrolides) are all relatively effective against organisms that are commonly resistant to penicillin and amoxicillin.
Insights
Traditional antibiotics like amoxicillin are less effective against resistant bacteria. Newer extended-spectrum antibiotics offer an alternative for bacterial respiratory infections, improving treatment outcomes.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Traditional antibiotics (amoxicillin, tetracycline, erythromycin) are first-line for bacterial respiratory infections.
- Antibiotic effectiveness is limited by local resistance patterns and patient factors.
- Significant resistance exists in Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis to amoxicillin and penicillin.
Purpose of the Study:
- To evaluate the role of newer extended-spectrum oral antibiotics.
- To identify alternatives for bacterial respiratory infections caused by resistant pathogens.
Main Methods:
- Review of antibiotic resistance patterns in the United States.
- Analysis of the efficacy of extended-spectrum antibiotics against resistant strains.
Main Results:
- Amoxicillin and penicillin resistance rates are high for key respiratory pathogens.
- Extended-spectrum oral antibiotics demonstrate effectiveness against resistant organisms.
- Cefuroxime axetil, cefpodoxime, amoxicillin-clavulanate, clarithromycin, and azithromycin are effective alternatives.
Conclusions:
- Selective use of newer extended-spectrum antibiotics is indicated for resistant bacterial respiratory infections.
- These agents provide viable treatment options when traditional antibiotics fail.
- Understanding local resistance is crucial for effective antibiotic selection.