A comparative Study on Phenotypic detection of Amp-C Beta Lactamases and Extended Spectrum Beta Lactamases in Gram Negative Bacterial urine isolates in a tertiary care hospital

The prevalence of multi drug resistant Gram Negative bacteria has increased in the past few years and the bacterial strains producing Amp-C Beta Lactamase and Extended Spectrum Beta Lactamase are of particular concern (1). With the increase in occurrence and different types of these multiple -lactamase enzymes, early detection is crucial. The benefits of which include implementation of proper antibiotic therapy and to frame infection control policy. Amp C Beta lactamase confer resistance to aminopencillins, cephalosporin, oxyimino-cephalosporins (cefoxitin cefotetan) and monobactams and are not affected by clavulanic acid like Extended Spectrum Beta Lactamase producers The objective of the present study is to screen and phenotypically detect Amp-C Beta Lactamase and Extended Spectrum Beta Lactamase in Gram Negative Bacterial urine isolates. Out of the 100 cefoxitin and ceftazidime resistant strains taken for study 71 were found to produce Amp-C Beta lactamase 81 strains were found to produce ESBL. 17 strains were resistant to both cefoxitin-cloxacillin combination disc and ceftazidime-clavulanic acid disc. They are subjected to meropenem sensitivity and the results were analysed