A method for determining whether a microorganism produces an AmpC β-lactamase is disclosed in which a culture of a microorganism suspected of producing a β-lactamase that inactivates a β-lactam-containing antibiotic is admixed with an effective amount of each of i) a β-lactam-containing antibiotic,...http://www.google.com/patents/US20080102483?utm_source=gb-gplus-sharePatent US20080102483 - Device and direct method for detection of antibiotic-inactivating enzymes
