| prevalence and antibiotic resistance profiles of escherichia coli o157:h7 in beef products from retail outlets in gaborone, botswana. | four hundred meat samples (134 meat cubes, 133 minced meat, 133 fresh sausages) were collected from 15 supermarkets and butcheries in gaborone, botswana, between the summer months of october 2002 and march 2003. samples were assayed for escherichia coli o157 by selective enrichment in modified e. coli broth containing novobiocin, followed by immunomagnetic separation and plating onto sorbitol macconkey agar supplemented with potassium tellurite. the isolates were biochemically and serologically ... | 2005 | 15726987 |