Coaggregation of and other black-pigmented bacteroides with several oral bacteria was studied with “reagent” strains specially prepared by methods that have been described previously. coaggregated with and spp., but not with any spp. Coaggregation of with other bacteria was inhibited and reversed by lactose. Of the asaccharolytic black-pigmented bacteroides, only demonstrated any coaggregation with other bacteria, whereas within the saccharolytic species, showed a marked ability to coaggregate with several species of oral bacteria. This property of coaggregation by may be an important factor in the pathogenesis of periodontal infections.


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