Purpose: Perilla seed (PS) is the most common cause of seed-induced anaphylaxis in Korean children, but the reports on PS allergy, including phenotype and cross-reactivity, are rare. The aim of this study is to assess the clinical characteristics of PS allergy and investigate cross-reactivity with sesame seed (SS). Methods: Through a retrospective medical record review, patients with clinical PS allergy were identified in a single tertiary hospital. Clinical characteristics of allergic reaction upon exposure to PS and SS, results of skin prick test (SPT) to PS and SS, and the levels of serum SS-specific immunoglobulin E (SS-sIgE) were investigated. Cross-reactivity between PS and SS was studied using IgE enzymelinked immunosorbent assay (ELISA) inhibition. Results: The median age of 34 PS-allergic children was 41.5 months (range, 10 months to 12 years), and the proportion of anaphylaxis upon exposure to PS was 29.4% (n = 10). The PS SPT was positive in 94.1% (n = 32) with the median wheal size of 6.25 mm. Among PS-allergic children, the percentages of patients with positive symptoms, negative symptoms, and indeterminate symptoms upon exposure to SS were 8.8%, 41.2%, and 50%, respectively. Out of 14 PS-allergic children who were tolerant to SS, positive sensitization to SS was noticed in 78.6% by serum SS-sIgE, and 57.1% by SS SPT. Partial cross-reactivity between PS and SS was identified in IgE ELISA inhibition. Conclusion This study reported the clinical profiles and SPT results in a relatively large number of PS-allergic children and identified the partial cross-reactivity between PS and SS for the first time.

Purpose: In food allergy, significant component antigens can be assessed by using the microarray. The purpose of this study was to evaluate the diagnostic value of component resolved diagnosis (CRD) in young children with kiwifruit allergy. Methods: Through a retrospective review of medical records, we evaluated the clinical characteristics of 12 children who underwent measurement of serum immunoglobulin E concentrations to kiwifruit (kiwi-sigE) and were diagnosed as kiwifruit allergy. We applied ImmunoCAP ISAC-CRD 112 using the residual sera of patients at the initial visit. Results: The median age of kiwifruit allergic children was 33.5 months (range, 13 to 84 months), and the proportion of systemic reactions, including 2 anaphylaxis cases, was 66.7%. Four had localized reactions on the lips. A total of 11 (91.7%) were sensitized to Act d 1; among them, 8 were mono-sensitized to Act d 1 and 3 were sensitized to ≥ 2 kiwifruit components. There was no significant difference in CRD results between those with systemic reactions and those with local reactions. Conclusion Act d 1 is the major allergenic component in Korean young children with clinical kiwifruit allergy. The additional diagnostic value of the CRD in diagnosing and predicting the severity of kiwifruit allergy is expected to be low in young children.