TY - JOUR T1 - IMPORTANCE OF CATALASE ENZYME IN VIRULENCE OF ISONIAZID RESISTANT ST RAINS OF MYCOBACTERIUM TUBERCULOSIS IN GUINEAPIGS TT - JF - MJIRI JO - MJIRI VL - 14 IS - 3 UR - http://mjiri.iums.ac.ir/article-1-868-en.html Y1 - 2000 SP - 293 EP - 295 N2 - In this study, twenty-five strains of Mycobacterium tuberculosis resistant to isoniazid (INH) were isolated from patients with tuberculosis (TB). Nine strains (36%) were found to be virulent in guinea-pigs [root index virulence (RIVĀ» 1 ]. The remaining sixteen strains (64%) were non-virulent (RIV M3 ER -