The World Health Organization (WHO) estimates that more than two billion people, one-third of the world's population, are infected with dormant Mycobacterium tuberculosis, the bacteria that cause tuberculosis (TB), a disease that usually affects the lungs.

Please help keep the community civil. The Doctors moderates this forum and all comments must follow TheDoctorsTV.com Community Guidelines and New Terms of Use . The Doctors reserves the right to use the comments you submit in whole or in part, and to use the commenter’s name and location, in any medium. Note that DISQUS operates this forum and you must log-in or register with DISQUS to participate.