Macadamia nut allergy in children: clinical features and cross-reactivity with walnut.

Macadamia nuts, the seeds of Macadamia tetraphylla or Macadamia integrifolia of family Proteaceae, are a familiar food item. Previous case reports of macadamia nut allergy demonstrated the possibility of false negative IgE antibody test results and cross-reactivity of macadamia nut with hazelnut.1-5 However, the clinical features of childhood macadamia nut allergy and the cross-reactivity of macadamia nut with foods other than hazelnut remain understudied.