Anaerobic bacteria in septicaemia and endocarditis

Area of Science:

• Microbiology
• Infectious Diseases
• Clinical Medicine

Background:

• Anaerobic bacteria are common in human microflora but can cause severe infections like septicaemia and endocarditis.
• Bacteroides fragilis is the predominant anaerobic isolate in septicaemia, often following surgical procedures.
• Anaerobic endocarditis, though uncommon, presents with distinct features compared to facultative anaerobic bacterial endocarditis.

Purpose of the Study:

• To review current knowledge on anaerobic bacteria in human microflora and their role in septicaemia and endocarditis.
• To discuss virulence factors, antibiotic susceptibility, and clinical findings associated with anaerobic bacterial infections.
• To highlight the importance of appropriate antibacterial treatment for anaerobic septicaemia.

Main Methods:

• Literature review of existing studies on anaerobic bacterial infections.
• Analysis of clinical features, predisposing factors, and outcomes of anaerobic septicaemia and endocarditis.
• Examination of antibiotic susceptibility patterns and virulence factors of anaerobic bacteria.

Main Results:

• Anaerobic septicaemia, often polymicrobial, presents with jaundice, septic thrombophlebitis, and abscesses, with a 10% mortality with treatment versus 60-80% without.
• Anaerobic endocarditis, frequently caused by anaerobic cocci, P. acnes, and B. fragilis, shows a higher incidence of thromboemboli and mortality than facultative anaerobic endocarditis.
• Entry portals for anaerobic bacteria include the gastrointestinal, female genital, and respiratory tracts.

Conclusions:

• Anaerobic bacteria are significant pathogens causing life-threatening septicaemia and endocarditis.
• Early diagnosis and appropriate antibiotic therapy are crucial for improving outcomes in anaerobic bacterial infections.
• Understanding anaerobic bacteria's role, virulence, and susceptibility is vital for effective clinical management.