| prevalence of escherichia coli o157:h7 in range beef calves at weaning. | this study was designed to determine the prevalence of escherichia coli o157:h7 infection of beef calves at weaning, prior to arrival at the feedlot or mixing with cattle from other sources. fifteen range cow-calf herds, which weaned calves in october and november, were sampled in kansas, missouri, montana, nebraska and south dakota. faecal culture for e. coli o157:h7 was performed and anti-o157 serum antibody titres were determined by blocking elisa. thirteen of the 15 herds (87%) were found to ... | 1999 | 10579450 |
| prevalence of foodborne pathogens in bulk tank milk. | bulk tank milk from 131 dairy herds in eastern south dakota and western minnesota was examined for the presence of for foodborne pathogens. campylobacter jejuni, shiga-toxin producing escherichia coli, listeria monocytogenes, salmonella spp., and yersinia enterocolitica were detected in 9.2, 3.8, 4.6, 6.1, and 6.1% of bulk tank milk samples, respectively. thirty-five of 131 (26.7%) bulk tank milk samples contained one or more species of pathogenic bacteria. isolates of salmonella belonged to gro ... | 2001 | 11699446 |