CD63 and allergic disease: The study did not compare BAT specificity and sensitivity to SPT, sIgE or OFC specificity and sensitivity of allergy diagnosis.All analyzed nsLTPs induced basophil activation, as evidenced by increased CD63 expression, confirming their allergenicity in this group of patients. The median percentage of CD63-positive basophils for all analyzed nsLTPs exceeded 60% at the highest allergen dose.