An Overview on Epidemiology of Tuberculosis.

Tuberculosis (TB) is a progressive granulomatous infectious disease caused by the gram positive, acid fast bacilli classified under the genus Mycobacterium. Tuberculosis in human is mostly by Mycobacterium tuberculosis and primarily affects lungs causing pulmonary tuberculosis. It can also affect intestine, meninges, bones, joints, lymph nodes, skin and other tissues of the body causing extra-pulmonary tuberculosis. Human TB is transmitted mainly through droplet infection and droplet nuclei. Infection of human with M. avium and M. africanum is very rare. M. microti is not known to cause TB in human, while M. bovis has a wider host range. Human may be infected by M. bovis through milk and milk products or meat of an infected animal. It is estimated that in…