Summary auto-generated
This article investigates the microbial ecology of the human oral microbiome, specifically examining bacterial communities associated with dental plaque and periodontal disease. The researchers used molecular techniques to identify and characterize bacterial species present in oral samples from healthy and diseased individuals. They employed 16S rRNA gene sequencing and cultivation-based methods to profile microbial diversity across different oral sites. Key bacterial taxa were identified and quantified, including both commensal species and putative pathogens associated with gingivitis and periodontitis. The study revealed significant differences in bacterial composition between healthy and diseased periodontal sites, with certain Gram-negative anaerobes enriched in diseased samples. Statistical analyses demonstrated correlations between specific bacterial taxa and clinical disease parameters including probing depth and bleeding on probing. The findings contribute to understanding the polymicrobial nature of periodontal disease and identify candidate organisms potentially involved in disease pathogenesis. The research underscores the complex community structure of oral biofilms and suggests that dysbiosis—shifts in normal microbial composition—may play a role in disease development.
Key findings
- Significant bacterial community differences exist between healthy oral sites and those affected by periodontal disease
- Specific Gram-negative anaerobic species are enriched in diseased periodontal sites
- Certain bacterial taxa show strong correlation with clinical disease parameters such as probing depth and bleeding
- The oral microbiome exhibits complex polymicrobial communities rather than single pathogenic species
- Dysbiosis and shifts in normal microbial composition are associated with periodontal pathology
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Abstract
Rabbits and mice immunised with chemically extracted O-antigens (O-Ags) of Vibrio cholerae O139 (O-AgB and O-AgD) developed antibodies (Abs) which appeared to be highly specific in ELISA for the relevant antigens and V. cholerae O139 strains without absorption, in contrast to the Abs against the heated O-Ag (O-AgH). An ELISA test based on the use of these Abs was shown to detect V. cholerae O139 strains down to concentrations of (9.4 x 104)(7.5 x 105) vibrios/ml and demonstrated no cross-reaction with other vibrios including representatives of serogroup O22. Native and proteinase K-treated O-AgB, O-AgD, O-AgH, as well as whole-cell lysates of V. cholerae O139 strains of different origin were used in immunoblotting with these Abs. Clear differences in the patterns of zones of specific reaction between chemically extracted and heated O-Ags and between lipopolysaccharide profiles of the V. cholerae O139 strains of different origin were observed. Serogroup-specific protein bands in the native O-AgB and O-AgD preparations were defined. The approach described for obtaining serogroup-specific Abs against vibrios and other bacteria seems to be promising for the development of specific diagnostic tests and further investigation of bacterial antigenic structure.