The response of a host to any particular pathogen may involve the non-specific (innate) and specific (adaptive) immune system. The specific components adapt themselves to each new disease encountered and are able to generate pathogen-specific immunity. The prevalence of Escherichia coli O157:H7 has grown since its first description and despite all control measures, it remains a serious health concern. It is considered a worldwide threat not only because of its increasing incidence but also due to the severity of clinical complications during treatment, particularly its resistance to...