Immunology Terminologycontinued Immunology Review 371
TERM
Serum sickness
Thymus
Titer
Vaccination
Zone of equivalence
EXPLANATION
Type III hypersensitivity reaction that results from buildup of abs to animal serum used in some passive
immunizations.Small, flat bilobed organ found in thorax; site of T-lymph development. One of the primary lymphoid
organs.Means of expressing ab concentration; reciprocal of highest dilution with pos rxn.Injection of immunogenic material to induce immunity.When # of multivalent sites of ag & ab are approximately equal. Results in optimal precipitation.