The Boston Herald reports higher-than-normal levels of herpes virus are found in the brains of those who exhibited symptoms of Alzheimer's disease before dying. So far, this merely shows an "association" and says nothing definitive about "causation."
The finding has generated considerable excitement and interest in the research community which had hit several "walls" in their search for a helpful therapy. As the Instapundit likes to write in cases like this, "faster, please."