A Novel Integron in Salmonella enterica Serovar Enteritidis, Carrying the bla DHA-1 Gene and Its Regulator Gene ampR , Originated from Morganella morganii

Abstract
The genetic organization of the gene coding for DHA-1 and the corresponding ampR gene was determined by PCR mapping. These genes have been mobilized from the Morganella morganii chromosome and inserted into a complex sulI -type integron, similar to In6 and In7. However, they are not themselves mobile cassettes. This integron probably includes a specific site for recombination allowing the mobilization of diverse resistance genes, as observed for bla CMY-1 and bla MOX-1 .