How is Addison's disease related to tuberculosis (TB)?

Tuberculosis (TB), an infection that can destroy the adrenal glands, accounts for less than 20 percent of cases of Addison's disease in developed countries. When adrenal insufficiency was first identified by Dr. Thomas Addison in 1849, TB was the most common cause of the Addison's disease. As TB treatment improved, the incidence of adrenal insufficiency due to TB of the adrenal glands greatly decreased.

This answer is based on source information from the National Institute of Diabetes and Digestive and Kidney Diseases.