The launch of the Human Microbiome Project (HMP), and the corresponding interest in bioengineered probiotic therapies that this new NIH initiative is likely to generate, provide a unique opportunity for research examining ethical and social considerations in the introduction of new therapeutic modalities. To date, analysis of ethical and social considerations in the use of probiotics have focused on "over the counter" applications where physician involvement in the selection and administration of the probiotic is limited.

The proposed research seeks to contribute to an emerging literature that assesses the philosophical implications of the ecological concepts, metaphors, and analogies that are beginning both to frame our understanding of the human microbiome and to challenge entrenched mechanistic concepts of the human body and the human being -- entrenched concepts that not only include the "blueprint" analogies of the Human Genome Project but stretch back at least to the discovery of the circulation of the blood.