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Six hundred and twenty pulmonary tuberculosis patients were screened for diabetes mellitus. Thirty-three (5.3%) patients were found to be diabetic. Prevalence in males was 5.8% and in females, 4.4% Prevalence increases with age. Lower lobe tuberculosis was more common in the diabetics. The tuberculosis spectra in the diabetics included more advanced, exudative and cavitary types. The newly diagnosed diabetics tended to improve their glucose tolerance with adequate antituberculosis therapy. There was no statistical difference in the response rates (of the tuberculous disease) between those on oral agents and those receiving insulin.