Rhinosporidiosis: ultrastructural study of an infection in South Carolina.

We have morphologically described and ultrastructurally analyzed Rhinosporidium seeberi, the causative agent of rhinosporidiosis, obtained from a nasal polyp of a man who had never traveled to India or Ceylon. The morphology, endosporulation phases, and cell wall were similar to those in previously described infections. A common etiology is suggested and potential therapy is discussed.