Detection and serotyping of Actinobacillus actinomycetemcomitans isolates on nitrocellulose paper blots with monoclonal antibodies.

A combination of blotting of bacterial colonies on nitrocellulose paper discs and immunoenzymatic detection of bound antigens with specific monoclonal antibodies was used to detect and serotype Actinobacillus actinomycetemcomitans directly off the initial agar culture dish. The A. actinomycetemcomitans antigens, representative of specific colonies, were identified immunoenzymatically using monoclonal antibody specific for a species-specific antigen. The serotype of the bacteria in colonies was identified by dividing the blotting paper into sections and immunoenzymatically identifying the serotype antigens with serotype-specific monoclonal antibodies. This procedure provides for simple, rapid, sensitive and accurate identification and characterization of A. actinomycetemcomitans isolates from the initial isolation agar plates.