Browsing tag: Bacteroides

Pałeczki Gram-ujemne beztlenowo rosnące – diagnostyka i znaczenie kliniczne

Gram-negative anaerobic rods – diagnostics and clinical significance
M. Kierzkowska, A. Majewska, A. Sawicka-Grzelak, G. Młynarczyk

1. Wstęp. 2. Diagnostyka laboratoryjna beztlenowych pałeczek Gram-ujemnych. 3. Znaczenie kliniczne beztlenowych pałeczek Gram-ujemnych. 4. Podsumowanie

Abstract: Among the broad spectrum of anaerobic bacteria constituting the normal flora of humans, some exhibit pathogenic potential and are responsible for serious infections. Gram-negative anaerobic rods belonging to the genera Bacteroides, Parabacteroides, Prevotella, Fusobacterium and Porphyromonas represent the most common cause of endogenous, usually mixed, infections. Anaerobes are important pathogens causing infections after abdominal or gynecologic surgery, oral-cavity infections and other infections originating from the mouth or abdomen. The virulence of different species depends on the combination of bacterial properties, including surface structures, metabolic functions, the ability to avoid the host’s defenses and the capacity to damage tissues. Special laboratory procedures are needed for the isolation and identification of this diverse group of bacteria. The identification to the species level, if based on phenotypic features, is often time-consuming and not always easy to carry out. Some molecular methods may help in the everyday clinical microbiological practice in laboratories dealing with the diagnostics of anaerobic infections. The taxonomy of the anaerobic bacteria is in a state of continuous change, due to the constant addition of new species and the reclassification of the old ones.

1. Introduction. 2. Laboratory diagnostics of Gram-negative anaerobic rods. 3. Clinical significance of Gram-negative anaerobic rods. 4. Summary

Bacteroides spp. – znaczenie kliniczne, lekooporność i metody jej oznaczania

Bacteroides spp. – clinical significance, antibiotic resistance and identification methods
S. Niestępski, M. Harnisz E. Korzeniewska, A. Osińska, B. Dziuba

1. Wstęp. 2. Systematyka bakterii z rodzaju Bacteroides. 3. Znaczenie kliniczne Bacteroides spp. 4. Oporność na leki u Bacteroides spp.
4.1. Bakterie z rodzaju Bacteroides jako rezerwuar determinantów oporności. 4.2. Oporność na środki przeciwdrobnoustrojowe. 5. Metody określania lekowrażliwości. 6. Podsumowanie

Abstract: Anaerobic Bacteroides species are dominant microbiota of the digestive tract of mammals. Along with other symbiotic bacteria located in the gastrointestinal tract, they contribute to the proper functioning of the organism. Some Bacteroides species are highly pathogenic. Virulence of these bacteria is related to their polysaccharide capsule, lipopolysaccharide and a variety of enzymes and enterotoxin. In recent years, an increase of antibiotic resistance in Bacteroides spp. has been noted, therefore the changes to the antibiotic resistance patterns in these bacteria should be monitored. This study summarizes the current knowledge about the bacteria of Bacteroides species.

1. Introduction. 2. Taxonomy of Bacteroides species. 3. Clinical significance of Bacteroides spp. 4. Antibiotic resistance. 4.1. Bacteroides species as a reservoir of antimicrobial resistance determinants. 4.2. Antimicrobial resistance. 5. Methods of drug resistance determination. 6. Summary