Some of the bacilli travel to the lymph nodes via the lymph system. These can travel to other parts of the body and infect other organ systems.

Go to http://library.med.utah.edu/WebPath/TUTORIAL/MTB/MTB.html for more information about the spread of TB to other areas of the body. The link above is part of The Internet Pathology Laboratory for Medical Education, copyright of Edward C. Klatt, M.D., Mercer University School of Medicine, Savannah, Georgia.