For every cell in your body, you support 10 bacterial cells that make vitamins, trigger hormones and may even influence how fat you are; guess what happens when you take penicillin? Alan Hudson, of Wayne State's Medical School says microbes that were once thought to be eliminated by antibiotics can still thrive in the body, and that raises disturbing questions about how best to treat infections. He has found Chlamydia in arthritic knees, pneumonia in Alzheimer's patient's brains and common mouth bacteria in the arterial plaque of heart attack patients. So physicians crank up the antibiotics, but they may be killing the good germs with the bad. The article includes a photo of Hudson in his lab at Wayne State .