Are SHV beta-lactamases universal in Klebsiella pneumoniae?

The status of SHV-1 or related β-lactamases as “typical” of Klebsiella pneumoniae prompted debate at the 39th Interscience Conference of Antimicrobial Agents and Chemotherapy. To test whether SHV-type enzymes are ubiquitous in this species, as previously asserted by one of us, ([2][1]) we