Neonatal diarrhoea of piglets. Isolation of toxigenic Escherichia coli strains producing STa, LT, and VT

Abstract

Toxigenic Escherichia coli strains play an important role in the genesis of the enteric colibacillosis of swine., For this reason these mircoorganisms was investigated in faeces of piglets with diarrhoea.

A total of 79 (27.3%) toxigenic Escherichia coli strains were isolated, of which 46 (58.2%) were STa, 20 (25.3%) LT and 13 (16.5%) VT. Five out of 13 VT strains synthesised VT1, 3 VT2 and 5 expressed VT1 and VT2 simultaneously. One strain that synthesised both VT1 and VT2 belonged to the serotype O149: K91; K88 and 2 strains STa+ corresponded to the serotypes O9: K35. The other one belonged to O149: K91.