during the period february 1963 to september 1964 , the incidence of strains of tubercle bacilli excreted by newly diagnosed , previously untreated patients with tuberculosis in canada that were resistant to the major antituberculosis drugs , viz . streptomycin , para-aminosalicylic acid and isoniazid , was 4.8 % .
C0041296
tuberculosis
C0030125
para-aminosalicylic acid