A STUDY ON EXTENDED-SPECTRUM β-LACTAMASE GENES FROM CLINICALLY ISOLATED GRAM-NEGATIVE BACTERIA IN BAHAWALPUR

Main Article Content

Muhammad Rizwan
Waqas Ashraf
Muhammad Moazam Jalees
Rafia Anwar
Hafiz Muhammad Siddiq
Bushra Nizam
Firasat Hussain
Saleha Zafar
Noman Ahmed
Muhammad Hanzala Imran
Safdar Ali

Keywords

ESBLs, gram negative bacteria, disk diffusion method, (PCR), CTXM, TEM

Abstract

The extended-spectrum β-lactamase (ESBL) genes have become more common, increasing the prevalence of multidrug-resistant gram-negative bacteria (GNBs) found in clinical patients. This cross-sectional study aimed to find the antimicrobial susceptibility of clinically isolated GNBs and their correlations with ESBL genes. A total of 140 samples were collected without any age discrimination and proceeded for their growth on culture media, gram staining, and biochemical characterization. Antimicrobial susceptibility testing was done by the Kirby-Baur disk diffusion method and PCR was employed for ESBLs associated genes (blaCTX-M, blaSHV, blaOXA, blaTEM). Out of 140 samples, the majority (60%) were GNBs, with K. Pneumoniae being the most prevalent (38.1%), followed by E. coli (29.8%), P. aeruginosa (15.5%), Proteus spp (10.7%), and Citrobacter spp (6%). These GNBs were resistant to various antibiotics, including cefixime (70.2%), amoxicillin (50%), cefoperazone (21.4%), imipenem (17.9%), ceftaroline (89%), gentamicin (72.6%), tobramycin (64.3%), amikacin (52.4%). Individual ESBL gene frequencies were blaCTX-M (40.5%), blaTEM (27%), blaOXA (21.6%), and blaSHV (10.8%). Species-wise, ESBLs‐producing genes blaCTX-M, and blaTEM were most frequent in K. Pneumoniae (13.5%) and E. coli (27%) while blaOXA in P. aeruginosa (13.5%) and blaSHV in Proteus spp (2.7%). In conclusion, blaCTX-M was the main gene associated with ESBL production in resistance clinical isolates followed by blaTEM, blaOXA, and blaSHV genes. To avoid resistance isolates, hospitals must implement infection control and antibiotic stewardship plans.

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