Related Experiment Videos
Microbiology of bacterial respiratory infections
1Department of Pharmacy Practice, Wayne State University, Detroit, MI 48201, USA.
Abstract:
The upper respiratory tract may become susceptible to bacterial infection as a result of health conditions such as allergies and viral infections, as well as the effects of smoking and airborne environmental pollutants. Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis are the most common bacterial pathogens in upper and lower respiratory tract infections. Streptococcus pyogenes is the predominant bacterial pathogen in pharyngitis and tonsillitis. Bacterial pathogens adhere to mucous membranes and colonization ensues. In an otherwise healthy individual the host immune system responds to the invading bacteria resulting in edema and swelling. If antimicrobial treatment does not eradicate the invading organisms and successfully interrupt the progress of the infection, the patient may develop recurrent or chronic disease. S. pneumoniae and other pathogens once susceptible to penicillin and other antibiotics are now becoming resistant. Bacterial resistance has developed and disseminated because of the widespread use of antibiotics. Major mechanisms of bacterial resistance to antimicrobials in upper respiratory tract infections include enzymatic inhibition, membrane impermeability, alteration of target enzymes, active pumping out of antibiotic and alteration of the ribosomal target.
Insights
Bacterial respiratory infections are common, with pathogens like Streptococcus pneumoniae becoming resistant to antibiotics. Understanding resistance mechanisms is crucial for effective treatment.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Upper respiratory tract infections (URTIs) are frequently caused by bacteria such as Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis.
- Factors like allergies, viral infections, smoking, and pollution increase susceptibility to bacterial URTIs.
- Streptococcus pyogenes is a primary cause of pharyngitis and tonsillitis.
Purpose of the Study:
- To review the common bacterial pathogens involved in upper and lower respiratory tract infections.
- To discuss the mechanisms of bacterial resistance to antimicrobial agents.
- To highlight the growing challenge of antibiotic resistance in treating respiratory infections.
Main Methods:
- Literature review of common bacterial pathogens in respiratory infections.
- Analysis of factors contributing to susceptibility and colonization.
- Examination of established and emerging bacterial resistance mechanisms to antibiotics.
Main Results:
- Common pathogens include Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, and Streptococcus pyogenes.
- Bacterial resistance to antibiotics like penicillin is increasing due to widespread antibiotic use.
- Key resistance mechanisms include enzymatic inhibition, altered targets, and efflux pumps.
Conclusions:
- Antibiotic resistance poses a significant threat to the effective treatment of bacterial respiratory infections.
- Understanding bacterial resistance mechanisms is vital for developing new therapeutic strategies.
- Preventing recurrent or chronic infections requires successful eradication of pathogens and addressing resistance.