After adjusting for sex and other factors, the team found that people with blood type O — the most common blood type — had a 12% lower risk of suffering a stroke compared to other blood types.

James Harrison’s legacy is at the heart of a wild story about canny science, boundless goodwill and an errant blood transfusion vanquishing a devastating and deadly disease.

People who are infected a subsequent time with a different type of the dengue virus may experience something called "antibody-dependent enhancement" in which the body's immune response actually ...