IGHE and Allergy: Of the 30 patients who had allergy to V. affinis venom, IgE reactivity to its 45 kDa band was detected in 93% of the sera (28/30) (Fig. 3a) whereas of 30 patients who had a history of allergy to A. dorsata venom, 53% of the sera (16/30) had IgE reactivity to the 45 kDa band (Fig. 3b).