Background: Shiga toxin (Stx) producing Escherichia coli (STEC) colonise human intestinal tract and their infections have asymptomatic clinical manifestations which cause local and systemic pathological changes.
Objectives: This study intended to establish the role of Shiga toxin (Stx2d) in developing clinical manifestations in STEC infections using experimental models.
Methods: A total 300 stool samples were screened from hospitalised diarrhoeal patients enrolled in 2% surveillance system at International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b). The stx gene profile including their variants was identified by PCR.stx2d gene positive STEC PT187 was selected for toxin (s) preparation.Toxin was prepared by centrifugation of culture supernatant. Enterotoxicand paralytic-lethal activities were tested in rabbit ileal loops and mice, respectively.