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. 1997 Jan;35(1):20–24. doi: 10.1128/jcm.35.1.20-24.1997

Molecular characterization of Escherichia coli strains isolated from pigs with edema disease.

F M Aarestrup 1, S E Jorsal 1, P Ahrens 1, N E Jensen 1, A Meyling 1
PMCID: PMC229506  PMID: 8968875

Abstract

The present study was conducted to investigate the epidemiological relationship of isolates of Escherichia coli causing edema disease. Classical edema disease has not previously been described in Denmark, but between February 1994 and November 1995 cases appeared in 51 pig herds, among which direct or indirect trading contacts were confirmed for 36 of the herds. A total of 213 isolates from pigs with edema disease in Denmark and other countries and 23 E. coli O139 isolates from pigs with diarrhea or healthy pigs were analyzed to characterize their O serogroups, HindIII ribotypes, and pulsed-field gel electrophoresis (PFGE) types, and 183 of the isolates were also analyzed for their plasmid profiles. The resulting PFGE types of the isolates from pigs with edema disease were examined by cluster analysis. Ten isolates from three herds could not be typed with the available O antisera, whereas all other isolates were of serotype O139. However, all isolates from pigs with edema disease belonged to the same HindIII ribotype, which was not observed among the isolates from pigs with diarrhea or healthy pigs. All isolates from Danish pigs with edema disease except for three isolates originating from two herds belonged to the same or closely related XbaI PFGE types; the other three isolates were assigned to possibly related types. Isolates from pigs with edema disease in different countries belonged to different PFGE types. All isolates from Danish pigs with edema disease grouped together in one cluster, in contrast to isolates from other countries, which did not form any clusters. E. coli strains of serogroup O139 from pigs with diarrhea or isolated from the feces of healthy Danish pigs were very different. Plasmid profiles differed largely among isolates. However, among the isolates from Danish pigs with edema disease, one type predominated within herds. The present study indicated that most, if not all, of the observed cases of edema disease in Denmark were part of the same outbreak. The combination of PFGE typing and ribotyping was useful for studying the possible clonal relationship among strains, whereas plasmid profiling was less informative.

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Selected References

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