IgG4: a possible mediator of anaphylaxis in a haemophiliac patient

Abstract
Immunological investigations were carried out on a hemophiliac patient who had developed severe anaphylaxis to bovine factor VIII administration. Development of anaphylaxis in this patient was associated with sudden increase in total and specific Ig[immunoglobulin]G4 antibodies. The significance of this observation was discussed in relation to current evidence suggesting involvement of IgG4 antibodies in some anaphylactic conditions.