Caz-hi, and extended-spectrum TEM beta-lactamase (TEM-61), is derived from Caz-lo (TEM-11) by in vivo selection. [electronic resource] - Antimicrobial agents and chemotherapy Dec 1998 - 3328-9 p. digital Publication Type: Letter ISSN: 0066-4804 Standard No.: 10.1128/AAC.42.12.3328 doi Subjects--Topical Terms: Amino Acid SequenceCeftazidime--pharmacologyCephalosporins--pharmacologyDrug Resistance, MicrobialEscherichia coli--drug effectsKlebsiella pneumoniae--drug effectsbeta-Lactamases--genetics