Each of the following is a gram-negative micro-organism associated with periodontitis, except one. Which one is the exception?

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Streptococcus mutans is associated with dental caries. Evidence supports that Porphyromonas gingivalis, Treponema denticola, and Aggregatibacter actinomycetemcomitans are associated with increased incidence and severity of periodontitis and are gram-negative micro-organisms.

Each of the Following Is a Gram-Negative Micro-Organism Associated with Periodontitis