| | Conditions Treatments | Arthritis How does the immune system respond to foot? There is no such thing as a "foot" in the context of the immune system. The immune system responds to foreign substances, such as bacteria, viruses, and toxins. Arthritis - Related Articles Signs of Serious Skin Cancer Is the only treatment for hip fractures surgery? Carbohydrate Loading Diet What Foods Release Fat Burning Hormones Where is a dermatologist that accepts medicaid in Alexandria La? What does MaryKate mean? How to Bring Up the Emotions in a Man