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Enteropathogenicity of a new E. coli serotype O8 in young piglets
Preweaning colibacillosis is a major cause of economic loss to the swine industry in Vietnam and other countries. So in this study the enteropathogenicity of representative enterotoxigenic Escherichia coli (ETEC) strains obtained during an earlier epidemiologic survey conducted in five provinces in North Vietnam was examined. Very interesting not only for Vietnam because these bacteria are very aggressive!

This included isolates belonging to serotype O8 that produced heat-stable and heat-labile enterotoxins but did not produce any of the recognized fimbriae (F4, F5, F6, F41, F18).

In vitro hemagglutination (unique mannose-resistant hemagglutination activity with guinea pig, sheep, human, and chicken red blood cells at 37°C, but not at 18°C) and enterocyte brush border attachment assays suggested that the F– ETEC strains produced an unidentified colonization factor that promoted adherence to the intestinal epithelium.

Colostrum-deprived 1-day-old piglets challenged with an F– strain (1–2 x 109 bacteria) developed acute watery diarrhea within 4 hours of inoculation and suffered up to 20% weight loss, with comparable severity to piglets challenged with conventional F4 and F5 strains.

At necropsy, viable counts and histopathologic examination of intestinal sections demonstrated colonization of the duodenum, jejunum, and ileum by F4-positive strains.

In comparison, the F– and F5-positive strains attached exclusively to the ileum. Transmission electron micrographs of negatively stained F– cells grown at 37°C demonstrated the presence of fimbriae.

These results confirm the presence of a potentially new pathogenic ETEC fimbrial type in piggeries in Vietnam, with a unique hemagglutination property and attachment characteristics similar to ETEC bearing F5 fimbriae.


Source: T. N. Do, I. Wilkie, S. J. Driesen, V. A. Fahy and D. J. Trott (2006): Pathogenicity of Vietnamese Enterotoxigenic Escherichia coli Strains in Colostrum-deprived One-day-old Piglets. In: Vet Pathol 43:150-160 (2006)



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SWINE PRACTICE

Beta hydroxy beta methyl butyrate and the muscle fibre composition in growing pigsmembers
The aim of this recently online published study was to investigate the effects of excess leucine (Leu) vs. its metabolites α‐ketoisocaproate (KIC) and β‐hydroxy‐β‐methyl butyrate (HMB) on Leu metabolism, muscle fibre composition and muscle growth in growing pigs. Thirty‐two pigs with a similar initial weight (9.55 ± 0.19 kg) were fed 1 of 4 diets for 45 days: basal diet, basal diet + 1.25% L‐Leu, basal diet + 1.25% KIC‐Ca, basal diet + 0.62% HMB‐Ca. The results are very promising!

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  • Suitable antibiotic therapy to treat swine brucellosismembers
  • Pancuronium versus vecuronium in pigs members
  • Haemodynamic effects of pancuronium and vecuronium in pigsmembers


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