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
Avian immune system such as the availability of many embryos at precise stages of development and distinct B and T cell systems. Each population differentiates from a primary lymphoid organ: T cells in the thymus and B cells in the Bursa of Fabricius. Research has found that early feeding of hydrated nutritional supplements in chickens heavily affects the immune system development. This is often measured by weight of the Bursa of Fabricius, improved resistance to disease and earlier appearance of IgA. Unlike other animals, newly hatched chicks are born with an incomplete immune system. Here, the amniotic fluid and yolk of the egg