| periodontitis-associated marker bacteria in an urban north american patient population: application of a commercial immunoassay. | we used an immunoassay to demonstrate marker organisms (porphyromonas gingivalis, prevotella intermedia, and actinobacillus actinomycetemcomitans) in 3 private practice populations (f-me periodontist, 55 patients; mhm periodontist, 179 patients; and ewm general dentist, 19 patients). occurrence of the marker organisms involves the whole oral environment, not just individual sites, as shown by close correlation between presence of the marker organisms in 2 independent sites/samples within a singl ... | 1998 | 9926768 |