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Journal of Clinical Microbiology, May 1999, p. 1642-1645, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Genetic Diversity among Escherichia coli Isolates Carrying f18 Genes from Pigs with Porcine Postweaning Diarrhea and Edema Disease

Béla Nagy,1 Richard A. Wilson,2 and Thomas S. Whittam3,*

Veterinary Medical Research Institute of the Hungarian Academy of Sciences, Budapest, Hungary,1 and E. coli Reference Center2 and Department of Biology,3 Pennsylvania State University, University Park, Pennsylvania 16802

Received 15 June 1998/Returned for modification 18 August 1998/Accepted 11 December 1998

Multilocus enzyme electrophoresis was applied to detect allelic variation and multilocus genotypes (electrophoretic types [ETs]) among 43 Escherichia coli isolates from weaned pigs suffering from edema disease or from diarrhea. ETs were analyzed in relation to O serogroups and virulence genes (sta, stb, lt, stx2, and f18) by DNA hybridization. Genomic diversity was the lowest in serogroup O138, while virulence genes (stx2 and f18) were the most uniform in serogroup O139. In general, the serogroups or toxin and F18 fimbria types were not related to selected ETs, suggesting that the toxin and f18 fimbria genes in E. coli isolates from pigs with postweaning diarrhea or edema disease occur in a variety of chromosomal backgrounds.

* Corresponding author. Mailing address: Institute of Molecular Evolutionary Genetics, Pennsylvania State University, University Park, PA 16802. Phone: (814) 863-1970. Fax: (814) 865-9131. E-mail: tsw1{at}psu.edu.

Journal of Clinical Microbiology, May 1999, p. 1642-1645, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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