Diversification of Escherichia coli expressing an SHV-type extended-spectrum beta-lactamase (ESBL) during a hospital outbreak: emergence of an ESBL-hyperproducing strain resistant to expanded-spectrum cephalosporins.

Abstract excerpt

Twelve SHV-type extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli lac mutant isolates were recovered in October 1997 from 11 patients of the neonatal ward in a Warsaw hospital. The outbreak was clonal; however, some of the isolates expressed a much higher level of resistance to several beta-lactam antibiotics, including expanded-spectrum cephalosporins. This phenotype has been attributed to...

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