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Scatter plots of differences between pre- and post-treatment levels of salivary interleukin-8 (IL-8) in patients with periodontitis versus respective percentages of representative bacterial species in the oral microbiota: (A) Porphyromonas gingivalis; (B) Prevotella intermedia; (C) Fusobacterium nucleatum; and (D) Aggregatibacter actinomycetemcomitans. ∆IL-8 (ng/mL) = baseline IL-8–post-treatment IL-8.
