From the Discussion section of TFA: “In addition, there is one other species of Porphyromonas that is known to produce gingipains, Porphyromonas gulae (61). P.

From the Discussion section of TFA: “In addition, there is one other species of Porphyromonas that is known to produce gingipains, Porphyromonas gulae (61). P. gulae is a natural inhabitant of the oral cavity of companion animals such as dogs, and a recent study demonstrated that dogs can transmit P. gulae to the oral cavity of their owners (62). Research is underway to determine whether P. gulae may be contributing to the gingipain load in AD brains.”