Home
http://www.virbac.fr/ http://www.boehringer-ingelheim.com/ http://www.novartis.com/ http://www.animalhealth.bayerhealthcare.com/
vetcontact
Vetrinär
Tiermedizin
  WELCOME  
vetcontact
Vetrinär
Tiermedizin
  Home  
  Login / Newsletter  
vetcontact
Vetrinär
Tiermedizin
  CONTACTS  
vetcontact
Vetrinär
Tiermedizin
  Classifieds  
  New Products  
  VetCompanies  
  VetSchools  
vetcontact
Vetrinär
Tiermedizin
  PROFESSION  
vetcontact
Vetrinär
Tiermedizin
  Edutainment  
  VetAgenda  
  Presentations  
  Posters  
  ESAVS  
  Specialisation  
vetcontact
Vetrinär
Tiermedizin
  INSIGHT  
vetcontact
Vetrinär
Tiermedizin
  Congress News  
  Picture Galleries  
vetcontact
Vetrinär
Tiermedizin
  PRODUCTS  
vetcontact
Vetrinär
Tiermedizin
  Bayer  
  Boehringer Ing.  
  Novartis  
  Virbac

 
  Simply book for less...  
    

Bovine    Equine    Small Animal Practice    Swine Practice    Articles    Vetjournal    
deutsch english español polski francais
Home / WELCOME / Archiv / Swine Practice /     
 
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)



Tell a friend   |   Print version   |   Send this article

SWINE PRACTICE

Oral fluid and plasma oxytetracycline concentrations after i.m. administration in pigsmembers
The penetration of oxytetracycline (OTC) into the oral fluid and plasma of pigs and correlation between oral fluid and plasma were evaluated after a single intramuscular (i.m.) dose of 20 mg/kg body weight of long-acting formulation. An important study regarding one of the most popular long-acting antibiotics in pigs.

  • Novel highly pathogenic porcine reproductive and respiratory syndrome virus in Chinamembers
  • Calibration of the TonoVet and Tono-Pen Vet tonometers in pigs´ eyesmembers
  • Measurement of serum cobalamin and folate concentrations in pigs with commercially assaysmembers
  • Commercially available immunoassays for serum cobalamin and folate in pigsmembers
  • Ultrasound-guided vessel catheterization in adult pigsmembers
  • Association between porcine cytomegalovirus infection and PMWSmembers
  • Suitable antibiotic therapy to treat swine brucellosismembers
  • Pancuronium versus vecuronium in pigs members
  • Haemodynamic effects of pancuronium and vecuronium in pigsmembers
  • Exposure of pigs to lead from contaminated zinc oxide members
  • Conjugated Linoleic Acid and Growth Performance and Losses of Pigletsmembers
  • Introduction of PRRSV via Boar Semen into a PRRSV-Free Countrymembers


  • [ Home ] [ About ] [ Contact / Request ][ Disclaimer ]

    Copyright © 2001-2016 VetContact GmbH
    All rights reserved