IGHE and peanut allergic reaction: His specific serum IgE pattern nine month after PBSCT harvest was analysed and showed similar sensitization profiles compared to those of the transplant recipient.<h4>Conclusions</h4>Because of the close temporal association between the onset of allergic symptoms in the PBSC recipient it is reasonable to assume that the acquired peanut allergy had been transferred from the donor to the recipient by the PBSC graft.