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Emergence of antibiotic resistance in upper and lower respiratory tract infections
Abstract:
The increase in antibiotic resistance is of great concern to the medical community. The treatment of respiratory tract infections are significantly impacted by resistance, as 67% of antibiotic use in adults and 87% in children is for the treatment of such infections. The most common pathogens implicated in these infections are Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, and isolates of all 3 have developed resistance to some of the antibiotics currently on the market. In 1997, one third of S. pneumoniae strains were classified as penicillin resistant, up to 50% of H. influenzae strains produced beta-lactamase, and all M. catarrhalis strains produced beta-lactamase. As resistance can vary with geographic region and specific populations, one way to determine the-most effective antibiotic for an infection is to ascertain the resistance pattern of these pathogens from local laboratories or national surveillance studies. Breakpoints using pharmacodynamic data based on drug concentration present for at least 40% of the dosing interval, or area under the serum concentration curve:minimum inhibitory concentration ratios have been valuable for comparing the activities of oral agents. Of the currently available beta-lactams and macrolides, only amoxicillin/clavulanate and daily intramuscular ceftriaxone are active against more than 90% of all 3 respiratory pathogens. Newer quinolones are also active against these pathogens, but overuse is very likely to result in rapid development of resistance, and their use should be reserved for patients with treatment failure or significant drug allergies.
Insights
Antibiotic resistance is a major concern for respiratory infections. Amoxicillin/clavulanate and ceftriaxone are effective against common pathogens like Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis.
Area of Science:
- Medical microbiology
- Infectious diseases
- Pharmacology
Background:
- Antibiotic resistance poses a significant threat to treating respiratory tract infections.
- High antibiotic usage in adults (67%) and children (87%) for respiratory infections contributes to resistance.
- Key pathogens like Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis exhibit increasing resistance.
Purpose of the Study:
- To review the impact of antibiotic resistance on respiratory tract infections.
- To identify effective antibiotic treatments against common respiratory pathogens.
- To discuss strategies for monitoring and managing antibiotic resistance.
Main Methods:
- Literature review of antibiotic resistance patterns.
- Analysis of pathogen resistance data (e.g., penicillin resistance in S. pneumoniae, beta-lactamase production in H. influenzae and M. catarrhalis).
- Evaluation of pharmacodynamic breakpoints and drug activity.
Main Results:
- In 1997, significant resistance was observed: one-third of S. pneumoniae were penicillin-resistant, up to 50% of H. influenzae produced beta-lactamase, and all M. catarrhalis produced beta-lactamase.
- Amoxicillin/clavulanate and intramuscular ceftriaxone demonstrate high activity (>90%) against all three major respiratory pathogens.
- Newer quinolones are effective but risk rapid resistance development and should be reserved.
Conclusions:
- Understanding local resistance patterns is crucial for effective antibiotic selection.
- Amoxicillin/clavulanate and ceftriaxone are valuable therapeutic options for common respiratory pathogens.
- Judicious use of newer agents like quinolones is necessary to preserve their efficacy.