*On a interesting side note, the disease I
have, Sarcoidosis, we typically
have an anergy
to mycobacterium species. Another words a negative PPD doesn't mean we don't carry an infection of M. tuberculosis, kind of similar to HIV patients. Also they constantly find Mycobacterium DNA in granuloma tissue in the majority of Sarc patients. That's how I ended up with a fixation with Tuberculosis.