Posted: August 16th, 2017

Which type of hypersensitivity reaction involves immune complexes formed when antigens bind to antibodies?

Which type of hypersensitivity reaction involves immune complexes formed when antigens bind to antibodies?
a) Type III
Type III hypersensitivity is associated with systemic lupus erythematosus, rheumatoid arthritis, serum sickness, certain types of nephritis, and some types of bacterial endocarditis.
b) Type I
Type I or anaphylactic hypersensitivity is an immediate reaction, beginning within minutes of exposure to an antigen.
c) Type II
Type II, or cytotoxic, hypersensitivity occurs when the system mistakenly identifies a normal constituent of the body as foreign.
d) Type IV
Type IV, or delayed-type, hypersensitivity occurs 24-72 hours after exposure to an allergen.