isolation of e. coli o157:h7 from milk and cattle faeces from urban dairy farming and non dairy farming neighbour households in dagoretti division, nairobi, kenya: prevalence and risk factors. | to estimate the prevalence of e. coli o157:h7 in milk and cattle faecal samples dairy and non dairy neighbouring households and to relate this prevalence to the risk to human health. | 2007 | 18338724 |