Frequency of Shiga toxin-producing Escherichia coli (STEC) isolates among diarrheic and non-diarrheic calves in Brazil - Leomil, L.; Aidar-Ugrinovich, L.; Guth, B. E. C.; Irino, K.; Vettorato, M. P.; Onuma, D. L.; Castro, Antonio Fernando Pestana de (Veterinary Microbiology, 2003)