INHA and tuberculosis: This study performed detailed molecular characterization of all MDR-TB strains collected during a 12-year period (2006 to 2017) to detect mutations in seven major gene targets (rpoB, katG, inhA, pncA, embB, rpsL and rrs) conferring resistance to rifampicin, isoniazid, pyrazinamide, ethambutol and streptomycin.