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Tuberculosis (tuberculosis, tuberculosis) is a chronic infectious disease. Adolescents and the elderly are most often infected because their immune system is low in their organism. Tuberculosis (tuberculosis, tuberculosis) is a chronic infectious disease. Adolescents and the elderly are most often infected because their immune system is low in their organism. Tuberculosis (tuberculosis, tuberculosis) is a chronic infectious disease. Adolescents and the elderly are most often infected because their immune system is low in their organism. Tuberculosis (tuberculosis, tuberculosis) is a chronic infectious disease. Adolescents and the elderly are most often infected because their immune system is low in their organism. Tuberculosis (tuberculosis, tuberculosis) is a chronic infectious disease. Adolescents and the elderly are most often infected because their immune system is low in their organism.