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Antimicrobial resistance pattern and resistance to third generation cephalosporins has become increased worldwide. The detection of extended spectrum lactamases (ESBLs) and metallobetalactamases (MBLs) among members of Enterobacteriaceae family guide us to use Beta lactam, if not tested leading to treatment failure. One year prospective study, our aim is to detect ESBL and MBL producing gram negative bacilli from various clinical samples. A total of 100 Gram negative bacilli were processed. ESBL was detected by phenotypic confirmatory disc diffusion test (PCDDT) using Ceftazidime / Cefotaxime alone and in combination with clavulanic acid. MBL detection was done by Imipenem EDTA combined disc diffusion test (CDDT), double disc synergy test (DDST) and Modified Hodge test. | Detection of ESBL and MBL producing gram negative bacilli from various clinical samples at a tertiary care hospital