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Table 1 Screening for extended-spectrum β-lactamases (ESBLs) production by certain pathogenic bacterial isolates using different methods

From: Natural outer membrane permeabilizers boost antibiotic action against irradiated resistant bacteria

Isolates no. Bacterial Species (GNB) DDST result MDDT result Combined disc method Nitrocefin test result Production of beta- lactamase
CFP-SCF PRL-TZP
1 Escherichia coli non-producer
2 Escherichia coli + + + + + Producer
3 Escherichia coli non-producer
4 Acinetobacter baumannii + + + + + Producer
5 Acinetobacter baumannii non-producer
6 Acinetobacter baumannii non-producer
7 Pseudomonas spp. non-producer
8 Pseudomonas spp. + + + + + Producer
9 Pseudomonas spp. + + + + + Producer
10 Pseudomonas spp. non-producer
11 Pseudomonas spp. non-producer
12 Klebsiella pneumoniae non-producer
13 Enterobacter spp. + + + + + Producer
14 Enterobacter spp. non-producer
15 Enterobacter spp. non-producer
  1. DDST Double disk synergy test, MDDT Modified double disk synergy test, CFP Cefoperazone, SCF Cefoperazone sulbactum. PRL Piperacillin, TZP Piperacillin tazobactam, GNB Gram- negative bacilli