Emergence of Multidrug-ResistantSalmonella entericaSerotypeTyphimurium DT104 Infections in the United States

Strains of salmonella that are resistant to antimicrobial agents have become a worldwide health problem. A distinct strain of Salmonella enterica serotype typhimurium, known as definitive type 104 (DT104), is resistant to ampicillin, chloramphenicol, streptomycin, sulfonamides, and tetracycline and has become a major cause of illness in humans and animals in Europe, especially the United Kingdom.To characterize typhimurium DT104 infections in...