In two cases with oral involvement, FISH was able to differentiate T. pallidum from oral treponemes and showed infection of the oral mucosa and tonsils, respectively. [ncbi.nlm.nih.gov]

Fish Shellfish Immunol. 84, 912–919. doi: 10.1016/j.fsi.2018.10.071 PubMed Abstract CrossRef Full Text Google Scholar Kohara, K., Tabara, Y., Yamamoto, Y., Igase, M., and Miki, T. (2002). [frontiersin.org]

A 49-year-old man complaining of epigastric pain underwent endoscopy, during which thickened stomach folds below the fundus were observed. Microscopic examination of gastric tissue biopsy specimens revealed chronic active gastritis. [ncbi.nlm.nih.gov]

The rectal mass and symptoms resolved following penicillin therapy. This case and a review of previously reported cases of anorectal syphilis emphasize the significance of these often neglected and misdiagnosed lesions of syphilis. [ncbi.nlm.nih.gov]

With the use of immunofluorescence and immunoperoxidase methods we have succeeded in identifying T. pallidum in the gastric wall of a patient who initially had cutaneous manifestations of secondary syphilis and gastric symptoms. [ncbi.nlm.nih.gov]