Medical Journal of The Islamic Republic of Iran (MJIRI)

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Tuberculosis remains a major public health problem in both developing and developed countries. Drug-resistant tuberculosis is an increasing health problem and serious challenge to tuberculosis (TB) control programs. Information about the susceptibility pattern of Mycobacterium tuberculosis isolates against anti-tuberculosis drugs is an important aspect to TB control. The objectives of the study were to evaluate the frequency of drug-resistance and to survey the nature of drug resistance among patients with pulmonary tuberculosis. Ninety-one M. tuberculosis strains were isolated from sputum samples of patients referred to Cerrhapasa Medical Faculty Hospital, Istanbul, Turkey, during a 9 month period. Drug susceptibility testing was performed to isoniazid (INH), streptomycin (SM), ethambutol (EMB) and rifampin (RMP) on Lowenstein-Jensen medium according to proportion method. Total resistance was identified in 40 of 91 patients (44%). The highest rate of primary resistance was to SM (21.1 %), followed by INH (15.8%), RMP (5.3%) and EMB (2.6%). Secondary resistance was most frequent to INH (33.3%), followed by SM (28.6%), RMP (23.8%) and EMB (14.3%). Multidrug resistance (MDR) was observed in 6 of the 91 cases (6.6%). Due to the high prevalence of drug resistance, particularly in developing countries, further studies should be conducted regularly to monitor resistance in these countries.

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