| prevalence and characteristics of shiga toxin-producing escherichia coli in beef cattle slaughtered on prince edward island. | fecal swabs obtained from a random sample of 1,000 beef slaughter steers and heifers from 123 prince edward island (p.e.i.) farms were examined for the presence of shiga toxin-producing escherichia coli (stec) using a vero cell assay (vca). multiple isolates from each positive sample were tested similarly. vca-positive isolates were confirmed as e. coli biochemically, tested for drug resistance, serotyped, and tested by polymerase chain reaction (pcr). animals were classified as positive when an ... | 2000 | 11079704 |