Fig. 2
From: Treponema pallidum Immunohistochemistry is positive in human intestinal Spirochetosis
a The T. pallidum immunostain highlights numerous spiral organisms in the lamina propria. Some macrophages also contain ingested organisms. These findings are unapparent on H&E or Warthin Starry stains (Original magnification ×600). b This T. pallidum immunostain shows not only the colonization of the surface epithelium characteristic of intestinal spirochetosis, but also reveals lamina propria macrophages harboring spiral organisms (Original magnification ×1000)