Development of neutralising antibodies (inhibitors)* Hypersensitivity/ allergic reactions; such reactions may include burning sensation in jaw and skull, chills (rigors), dry cough/ sneeze, flushing, lethargy, restlessness, tingling, hives, itching and rash, low blood pressure, fast heart rate, tightness of the chest, wheezing, swelling of the throat, anaphylaxis*, rash