| allergy and immunology | A medical specialty concerned with the hypersensitivity of the individual to foreign substances and protection from the resultant infection or disorder. (12 Dec 1998) |
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| immunology | <study> A subfield of biology that deals with the study of antigens and the immuneprocess and how humans and higher animals fight off disease. (09 Oct 1997) |
| transplantation immunology | A general term for the complex phenomena involved in allo- and xenograft rejection by a host and graft vs host reaction. Although the reactions involved in transplantation immunology are primarily thymus-dependent phenomena of cellular immunity, humoral factors also play a part in late rejection. (12 Dec 1998) |