Introduction: The Prevalence of ESBL producing Escherichia coli (E.coli) has increased throughout the world and is a major cause of treatment failure in Intensive Care Units (ICUs). The Antibiotic resistance is increasing at alarming levels and has emerged as a major public health concern of the 21
st century. The resistance to beta lactam antibiotics is a grave concern in treating infections in hospital settings especially in ICUs. The β-lactams are among the commonly used classes of antibiotics for treating infections however the production of beta lactamases by the bugs has made these antibiotics ineffective leading to drug resistance. This study has been done to determine the magnitude of extended spectrum beta lactamase (ESBL) producing E. coli isolates among the patients in ICUs of Government general hospital, Kakinada.
Aims: To determine the prevalence of ESBLs among Escherichia coli isolates in ICUs of this region.
Materials & Methods: This was a prospective study conducted for 3 months in the department of microbiology, Government general hospital Kakinada. The Escherichia coli isolates recovered from various samples of patient admitted to different ICUs, were subjected to ESBL production screening test by Kirby Bauer’s disc diffusion method as per CLSI guidelines.
Results: A total of 138 samples were collected in this study out of which 64 were culture positives and 74 were culture negatives. Out of total 64 samples 21 (33%) were Escherichia coli isolates, Out of 21 Escherichia coli 8 were (38%) ESBL producers. The highest prevalence of ESBL producers was seen in Paediatric ICU 3 (37%) and Gynaecology ICU 3 (37%). In this study highest prevalence of ESBL producing Escherichia coli was observed in urine samples (62.5%) followed by pus samples (25%) and sputum 1 (12.5%). The most susceptible antibiotics to the ESBL producers of E .coli were piperacillin – tazobactam (100 % sensitive), followed by imipenem (62.5%), and cefoperazone- sulbactam (37.5%).
Conclusion: This study highlights the prevalence of ESBL producing Escherichia coli in the ICUs of our hospital, and an in-depth analysis of their antibiogram will be helpful in formulating the antibiotic policy and prevent spread of ESBL strains. It is recommended that ESBL screening for all isolates, (Enterobacteriaceae family) for detecting antibiotic resistance and early institution of an appropriate antibiotic.