August von Wassermann was a German bacteriologist who is known for his pioneering work in the field of diagnostic immunology. He developed the Wassermann test, which is still used today to detect the presence of syphilis in a patient's blood. Synonyms for August von Wassermann include diagnostician, immunologist, bacteriologist, medical researcher, and medical innovator. He is also known as the inventor of the complement fixation test, a laboratory technique used to detect antibodies in a patient's blood. August von Wassermann's work on diagnostic tests has revolutionized the field of medicine and has benefited countless patients around the world.