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Journal of Clinical Microbiology, September 2006, p. 3074-3077, Vol. 44, No. 9
0095-1137/06/$08.00+0     doi:10.1128/JCM.00617-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Edema Disease Caused by a Clone of Escherichia coli O147

Amy F. Helgerson,1 Vijay Sharma,2 Amie M. Dow,1 Regina Schroeder,1,{dagger} Karen Post,3 and Nancy A. Cornick1*

Iowa State University, Department of Veterinary Microbiology, Ames, Iowa 50011,1 National Animal Disease Center, Ames, Iowa 50011,2 Rollins Animal Disease Diagnostic Laboratory, North Carolina Department of Agriculture and Consumer Services, Raleigh, North Carolina 276073

Received 22 March 2006/ Returned for modification 14 May 2006/ Accepted 11 June 2006

Edema disease is a systemic disease of weaned pigs caused by host-adapted strains of Escherichia coli, most commonly belonging to serogroup O138, O139, or O141. In the late 1990s, E. coli O147 strains containing the virulence genes f18, sta, stb, and stx2 were recovered from outbreaks of edema disease in the United States. Pulsed-field gel electrophoresis (PFGE) was used to determine that the majority of these strains (34/43) were closely related to one another. Subsequent analysis by multilocus restriction typing confirmed the PFGE results and indicated that the cluster of edema disease strains were only distantly related to other E. coli O147 strains. Serogrouping of edema disease isolates from the Iowa State University Veterinary Diagnostic laboratory recovered between 1996 and 2000 indicated that 42% belonged to serogroup O147. Our data suggest that these strains may be a common serotype of edema disease-causing E. coli in the United States.

* Corresponding author. Mailing address: Department of Veterinary Microbiology, 2130 Vet. Med. Bldg., National Animal Disease Center, Ames, IA 50011-1250. Phone: (515) 294-6499. Fax: (515) 294-8500. E-mail: ncornick{at}iastate.edu.

{dagger} Present address: Veterinary Specialists of Nevada, Reno, NV 89502.

Journal of Clinical Microbiology, September 2006, p. 3074-3077, Vol. 44, No. 9
0095-1137/06/$08.00+0     doi:10.1128/JCM.00617-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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