Primary Antituberculosis Drug Resistance at Turkish Military Chest Diseases Hospital in Istanbul
Objective: The aim of this study was to investigate the prevalence of primary drug resistance to tuberculosis. Methods: We evaluated the clinical data, radiological features and sputum samples from 365 newly diagnosed patients with a positive culture of pulmonary tuberculosis at the Turkish Military Chest Diseases Hospital, Istanbul, Turkey. No patients had taken antituberculosis drugs previously. The Bactec method was used to perform drug susceptibility testing for isoniazid, rifampicin, ethambutol, and streptomycin. Results: Primary resistance to one or more drugs was detected in 87 (23.8%) patients; resistance to isoniazid was most common (54 patients) followed by resistance to ethambutol (n = 39), rifampicin (n = 11), and streptomycin (n = 9). One-drug resistance was detected in 69 patients; two-drug resistance in 11, three-drug resistance in 6, and four-drug resistance in 1. Multidrug resistance (resistance to at least isoniazid and rifampicin) was detected in 10 patients. In logistic-regression analysis, primary drug resistance was associated with radiological advanced tuberculosis (p < 0.001). Conclusion: Primary resistance to one or more drugs used in treating tuberculosis is relatively high. It is necessary to regularly screen for and treat drug resistance among those who live in close quarters, such as army barracks, school dormitories and prisons. Regular surveillance of drug sensitivity patterns should be maintained to determine appropriate alternate drug regimens and detect the spread of resistant stains in the population.