Chronic thyroiditis and autoimmunization.

"Witebsky helped develop procedures for the isolation and partial characterization of A and B blood antigens. He also began the practice of neutralization of certain antibodies in the blood of universal blood donors.

"In 1957 he co-authored a paper the "Witebsky's postulates" which determined whether a disease entity could be regarded as an autoimmune disease:^[4]

• Direct demonstration of free circulating antibodies active at body temperature.
• Recognition of the specific antigen (for this antibody).
• Production of antibodies against same antigen in experimental animals.
• Experimental animal demonstrates same tissue changes in human." (Wikipedia article on Ernst Witebsky, accessed 8-2021)