Bacterial Concentration Fluorescence Immunoassay (BCFIA) for the Detection of Periodontopathogens in Plaque.

Abstract:

:A bacterial concentration fluorescence immunoassay (BCFIA) was developed to rapidly detect periodontopathic bacteria in human plaque samples. The BCFIA utilized fluorescent-tagged monoclonal antibodies (MAbs) directed against the lipopolysaccharide of selected Gram-negative bacteria. Microorganisms identified in plaque using the BCFIA included Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, and Fusobacterium nucleatum. The immunoassay procedure involved combining a patient's plaque sample with a species-specific fluorescein isothiocyanate-labeled MAb and then incubating the mixture in a specialized microtiter plate allowing the MAb to bind to its homologous bacteria. Bound and unbound fluorescent-tagged MAbs were separated by filtration and total bound bacterial fluorescence was determined with a fluorimeter. The relative number of a bacterial species in a given plaque sample was estimated by reference to a standard curve carried through the BCFIA. The BCFIA had a lower detection limit of near 104 specific bacterial cells in a mixed bacterial preparation or plaque sample. When compared to cultivable flora procedures in detecting the 4 periodontopathogens, the BCFIA had high levels of statistical sensitivity, 97% to 100%, while statistical specificity ranged between 57% and 92%. There was a 71% to 82% agreement between BCFIA and DNA probe methodology in detecting periodontopathogens in plaque. The BCFIA, when compared to cultivable flora, offers the advantage of evaluating both live and dead bacterial cells in plaque. This may in part, if not fully, explain the lower specificity values of the BCFIA when compared to cultivable flora. Screening plaque samples for periodontopathic bacteria is considerably faster and results in a greater frequency of detection with BCFIA than cultivable flora based methods. J Periodontol 1992; 63:1093-1101.

journal_name

J Periodontol

authors

Wolff LF,Anderson L,Sandberg GP,Reither L,Binsfeld CA,Corinaldesi G,Shelburne CE

doi

10.1902/jop.1992.63.12s.1093

subject

Has Abstract

pub_date

1992-12-01 00:00:00

pages

1093-1101

eissn

0022-3492

issn

1943-3670

journal_volume

63 Suppl 12S

pub_type

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