| prevalence of verotoxin-producing escherichia coli (vtec) 0157 in swedish dairy herds. | a prevalence study of verotoxin-producing escherichia coli o157 (vtec o157) was performed in 371 randomly selected dairy herds distributed throughout sweden. faecal and manure samples were collected and analysed by immunomagnetic separation and culturing. data were recorded for each herd regarding herd size, age of sampled animals and whether, in addition to cattle, the farm kept other animals. vtec o157 was isolated from 33 (8.9%) of the 371 investigated herds. the prevalence was higher (23.3%) ... | 2005 | 15816162 |