Molecular characterization of DHA-1-producing Klebsiella pneumoniae isolates collected during a 4-year period in an intensive care unit.

Seventeen Klebsiella pneumoniae isolates producing DHA-1 ß-lactamase were collected in an intensive care unit between 2006 and 2010. Molecular analysis revealed the predominance of ST48 and ST1263 clones of K. pneumoniae and the spread of DHA-1-encoding plasmids belonging to incompatibility group IncL/M or IncHI2.