August 18, 2017

Florence Barbara Seibert (October 6, 1897 – August 23, 1991) was an American biochemist. She is best known for identifying the active agent in the antigen tuberculin as a protein, and subsequently for isolating a pure form of tuberculin, purified protein derivative(PPD), enabling the development and use of a reliable TB test. Seibert is a member of the U.S. National Women's Hall of Fame.

Source: Wikipedia