Innate immunity provides much more than an initial host defense against microbial infection. Besides providing a broad range of protection against infection, components of innate immunity respond to tissue injury; they promote repair, contribute to the genesis of autoimmunity, respond to vaccines, and watch for cancer. Beyond these clearly immunological conditions, innate immunity is implicated in allergy, atherosclerosis, malignancy, obesity and osteoporosis conditions that plague many patients including transplant recipients.