Hyperimmunization is the presence of a larger than normal number of antibodies to a specific antigen. This creates a state of immunity greater than normal. Immune system overactivity can cause many different diseases.
Update Date 8/3/2013
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.