The emergence of extended-spectrum beta-lactamase (ESBL)- and metallo-beta-lactamase (MBL)-producing bacteria causing lower respiratory tract infection (LRTI) has resulted in fewer therapeutic options in treatment modalities. No studies regarding MBLs had been done so far in Nepal and a few researches on ESBLs were also just pilot studies. Therefore, this study was carried out to determine the bacterial etiology of LRTI and to assess the current levels of antimicrobial resistance in Nepal. Combination disk and Double disk synergy test methods were used for the detection of ESBL- and...