Titlebook: Between Pathogenicity and Commensalism; Ulrich Dobrindt,J?rg H. Hacker,Catharina Svanborg Book 2013 The Editor(s) (if applicable) and The

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,: Host–Microbe Relationships,teraction and effector molecules have been identified. The rare cases of . septicaemia are explained in terms of the host impairment required for such an outcome. We discuss possibilities for exploitation of lactobacilli for therapeutic delivery and mucosal vaccination.