Alzheimer's May Be Contagious Some cases may result from an infection: study By Evann Gastaldo, Newser Staff Posted Oct 5, 2011 7:17 AM CDT 1 comment Comments A woman, suffering from Alzheimer's desease, holds the hand of a relative on March 18, 2011 in a retirement house in Angervilliers, eastern France. AFP PHOTO / SEBASTIEN BOZON (Getty Images) (Newser) – Alzheimer's disease may, in some cases, be contagious, according to surprising results from a new study. "Some of the sporadic Alzheimer's cases may arise from an infectious process" similar to mad cow disease, a researcher says. In the study, mice that were injected with human brain tissue from Alzheimer's sufferers contracted the disease, while mice injected with healthy brain tissue did not. The new study, however, is preliminary and involves artificial conditions unlikely to occur in the real world. MSNBC notes that researchers are planning experiments to investigate whether Alzheimer's transmission would be possible in a more likely, natural scenario.