Alzheimer disease causes progressive neurologic deterioration and is reasonably common in elderly patients. It is characterized by specific patterns of memory loss, which progressively worsens and for which there is no treatment. Recent drug trials have been disappointing in that promising medications have failed to affect the disease. Interesting new hypotheses have emerged from basic science research suggesting that the neurofibrillary tangles characteristic of Alzheimer brain lesions form in response to infection of the brain. Interview with Rudolph Tanzi, PhD, of Harvard University; Berislav Zlokovic, MD, PhD, of the University of Southern California; and Andy Josephson, MD, of the University of California San Francisco, and editor of JAMA Neurology. Related article: Alzheimer Outlook Far From Bleak

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