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Antimicrobial Agents and Chemotherapy, April 1999, p. 846-849, Vol. 43, No. 4
0066-4804/99

Molecular Characterization of an Antibiotic Resistance Gene Cluster of Salmonella typhimurium DT104

Connie E. Briggs* and Pina M. Fratamico

Agricultural Research Service, Eastern Regional Research Center, U.S. Department of Agriculture, Wyndmoor, Pennsylvania 19038

Received 27 July 1998/Returned for modification 9 November 1998/Accepted 29 January 1999

Salmonella typhimurium phage type DT104 has become an important emerging pathogen. Isolates of this phage type often possess resistance to ampicillin, chloramphenicol, streptomycin, sulfonamides, and tetracycline (ACSSuT resistance). The mechanism by which DT104 has accumulated resistance genes is of interest, since these genes interfere with treatment of DT104 infections and might be horizontally transferred to other bacteria, even to unrelated organisms. Previously, several laboratories have shown that the antibiotic resistance genes of DT104 are chromosomally encoded and involve integrons. The antibiotic resistance genes conferring the ACSSuT-resistant phenotype have been cloned and sequenced. These genes are grouped within two district integrons and intervening plasmid-derived sequences. This sequence is potentially useful for detection of multiresistant DT104.

* Corresponding author. Mailing address: Agricultural Research Service, Eastern Regional Research Center, U.S. Department of Agriculture, Wyndmoor, PA 19038. Phone: (215) 233-6627. Fax: (215) 233-6559. E-mail: cbriggs{at}arserrc.gov.

Antimicrobial Agents and Chemotherapy, April 1999, p. 846-849, Vol. 43, No. 4
0066-4804/99


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