Dementia Caused By Infection??

"Study suggests brain's defense systems against infections may be cause of dementia." NY Times, May 26, 2016

Studies at Harvard suggest that virus, fungus or bacterium may pass through the membrane into the brain, and the plaque found in dementia may be the body's attempt to isolate and kill those invaders.  What an incredible suggestion.  The article says that dementia is decreasing (that has not been my personal observation), and the reason for that may be the better control of infections.  Fascinating.  This research is worth following.