AmpC beta-lactamases cause resistance to third-generation cephalosporins. including beta-lactamase inhibitors. In Escherichia coli from the German food production chain. the majority of AmpC beta-lactamase activity can be attributed to plasmid-mediated CMY-2 or overproduction of chromosomal AmpC beta-lactamase. https://www.dawnsdinners.com/product-category/cup-setting-knob/