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Current status of tuberculosis in developing countries

According to World Health Organization estimates one-third of the worlds population has been infected with Mycobacterium tuberculosis. Global incidence is expected to increase from 7.5 million new cases in 1990 to 10.2 million new cases by the year 2000--an increase of 36%. 95% of tuberculosis cases occur in developing countries. Tuberculosis is also one of the most common opportunistic infections associated with HIV infection in developing countries. In many areas rates of HIV among children with tuberculosis may be as high as those of adults. Given this association preventive measures for both AIDS and tuberculosis are necessary. Although the effectiveness of BCG vaccine in preventing tuberculosis in adults is limited it seems to be effective in preventing the often lethal forms of tuberculosis in children.