Autoimmune Disease Research Center

Definition of Autoimmunity

The healthy human body is equipped with a powerful set of tools for resisting the onslaught of invading microorganisms (such as viruses, bacteria, and parasites). Unfortunately, this set of tools, known as the immune system, sometimes goes awry and attacks the body itself. These misdirected immune responses are referred to as autoimmunity, which can be demonstrated by the presence of autoantibodies or T lymphocytes reactive with host antigens.

JHU Autoimmunity Home JHU Bloomberg School of Public Health

Johns Hopkins School of Public Health Logo

Web site designed by Alberto Fenu and Patrizio Caturegli