M. Alzayn

OmpF Downregulation Mediated by Sigma E or OmpR Activation Confers Cefalexin Resistance in Escherichia coli in the Absence of Acquired β-Lactamases.

This study identifies OmpF downregulation via Sigma E or OmpR activation as a mechanism for cefalexin resistance in E. coli without β-lactamase production.

Characterisation of AmpC Hyper-Producing Escherichia coli from Humans and Dairy Farms Collected in Parallel in the Same Geographical Region

This study characterizes AmpC hyper-producing E. coli from dairy farms and humans, identifies risk factors, and finds no evidence of zoonotic transmission.