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Original Article
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Volume 342:1242-1249 April 27, 2000 Number 17
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Ceftriaxone-Resistant Salmonella Infection Acquired by a Child from Cattle
Paul D. Fey, Ph.D., Thomas J. Safranek, M.D., Mark E. Rupp, M.D., Eileen F. Dunne, M.D., M.P.H., Efrain Ribot, Ph.D., Peter C. Iwen, M.S., Patricia A. Bradford, Ph.D., Frederick J. Angulo, D.V.M., Ph.D., and Steven H. Hinrichs, M.D.

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 by Osterholm, M. T.

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ABSTRACT

Background The emergence of resistance to antimicrobial agents within the salmonellae is a worldwide problem that has been associated with the use of antibiotics in livestock. Resistance to ceftriaxone and the fluoroquinolones, which are used to treat invasive salmonella infections, is rare in the United States. We analyzed the molecular characteristics of a ceftriaxone-resistant strain of Salmonella enterica serotype typhimurium isolated from a 12-year-old boy with fever, abdominal pain, and diarrhea.

Methods We used pulsed-field gel electrophoresis and analysis of plasmids and ß-lactamases to compare the ceftriaxone-resistant S. enterica serotype typhimurium from the child with four isolates of this strain obtained from cattle during a local outbreak of salmonellosis.

Results The ceftriaxone-resistant isolate from the child was indistinguishable from one of the isolates from cattle, which was also resistant to ceftriaxone. Both ceftriaxone-resistant isolates were resistant to 13 antimicrobial agents; all but one of the resistance determinants were on a conjugative plasmid of 160 kb that encoded the functional group 1 ß-lactamase CMY-2. Both ceftriaxone-resistant isolates were closely related to the three other salmonella isolates obtained from cattle, all of which were susceptible to ceftriaxone.

Conclusions This study provides additional evidence that antibiotic-resistant strains of salmonella in the United States evolve primarily in livestock. Resistance to ceftriaxone, the drug of choice for invasive salmonella disease, is a public health concern, especially with respect to children, since fluoroquinolones, which can also be used to treat this disease, are not approved for use in children.


Source Information

From the Nebraska Public Health Laboratory (P.D.F., P.C.I., S.H.H.), Omaha; the Departments of Internal Medicine (P.D.F., M.E.R.) and Pathology and Microbiology (P.D.F., P.C.I., S.H.H.), University of Nebraska Medical Center, Omaha; the Department of Health and Human Services, Lincoln, Nebr. (T.J.S.); the Foodborne and Diarrheal Diseases Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta (E.F.D., E.R., F.J.A.); and Wyeth–Ayerst Research, Pearl River, N.Y. (P.A.B).

Address reprint requests to Dr. Fey at the Departments of Internal Medicine and Pathology and Microbiology, University of Nebraska Medical Center, 985400 Nebraska Medical Center, Omaha, NE 68198-5400, or at pfey{at}unmc.edu.

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