Immune system or the use of immunosuppressive medication. In contrast, autoimmunity results from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include Hashimoto's thyroiditis, rheumatoid arthritis, diabetes mellitus type 1, and systemic lupus erythematosus. Immunology covers the study of all aspects of the immune system. Immunology is a science that examines the structure and function of the immune system. It originates from medicine and early studies on the causes of immunity to disease. The earliest known reference to immunity was during the plague of Athens in 430 BC. Thucydides noted that people who had
Fetal tissue implant Fetal tissue implant Fetal tissue implant or fetal cell therapy is an experimental medical therapy where researchers implant tissue from a fetus into a person as treatment of a disease. In the case of Parkinson's disease, it is hoped that the fetal tissue would produce chemicals, specifically dopamine, which is lacking in the diseased brain. This therapy is also being investigated for treatment of Alzheimer's disease and Huntington's disease. Fetal tissue is unique since it is fast growing and has a lower possibility of rejection from the host's immune system than adult cells. In 1982, seven people in Santa Clara