The immune system forms protective antibodies after natural infection and vaccination. These are similar but might differ in amount or type.

A monoclonal antibody is a manufactured protein that mimics natural antibodies. Learn how they help diagnose and treat diseases like cancer and COVID-19.

Monoclonal antibodies—used for arthritis, cancer, and more—are man-made versions of natural antibodies. Reviewed by a board-certified physician.

Antibody deficiency disorders are genetic diseases that impair one's ability to produce normal antibodies, making one prone to repeated infections.

Researchers are exploring the benefit of monoclonal antibodies, aka "manufactured" antibodies, as a possible treatment and prevention method against COVID-19.

Antibodies (a.k.a. immunoglobulins) are a category of five immune proteins that the body tailor-makes to help fight specific diseases and infections.

Thyroid disease is often caused by autoimmune antibodies, the most common of which is the anti-thyroperoxidase antibody.

Learn why biologic medications can result in the creation of anti-drug antibodies and what can be done when it happens. Reviewed by a board-certified physician.

Learn how breast milk can transfer COVID-19 antibodies to babies, and which types of antibodies can be passed from parent to child.

A COVID-19 antibody test can confirm if you have been previously infected with the coronavirus. Learn why it is used and what it can and cannot tell you.