Alice Catherine Evans was an outstanding microbiologist who made one of the most medically important discoveries of the 20th century. She is well-recognized for establishing that humans are infected by the once-common, painful disease brucellosis from raw cow and goat milk. Brucellosis, a recurrent disease also known as Malta or undulant fever, causes shooting pain in the joints, fever, and depression. For years, her research findings and results were scorned and ignored because of her gender and because she did not have a doctorate degree. She lobbied successfully for the pasteurization of all milk and lived to see the disease fall into obscurity.