This disease is notifiable in the UK, see NOIDs article for more detail. Tuberculosis (TB) is a chronic granulomatous disease. In humans it is caused by bacteria of the Mycobacterium tuberculosis complex (which includes M. tuberculosis, M. bovis and M. africanum).It is most commonly spread by inhalation of infected droplets (accounts for almost all cases in the UK).uberculosis (TB) is a chronic granulomatous disease. In humans it is caused by bacteria of the Mycobacterium tuberculosis complex (which includes M. tuberculosis, M. bovis and M. africanum).