Serum therapy is a term used to describe a medical treatment that involves the use of serum, which may help in the prevention or treatment of diseases. It is also referred to as immunoglobulin therapy, antiserum therapy, or antibody therapy. The use of serum therapy involves the administration of antibodies obtained from either human or animal sources, with the aim of enhancing the body's immune system. Other synonyms for serum therapy include plasma therapy, polyclonal antibody therapy, and monoclonal antibody therapy. These therapies have been used in the treatment of many diseases, including COVID-19, Ebola, and many other viral infections. Serum therapy is a promising area of medicine that is likely to continue growing in importance over the coming years.