1. Adverse reaction to Ficus Carica: reported case of a possible cross-reactivity with Der p1
- Author
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Eleonora Nucera, Arianna Aruanno, and S. Urbani
- Subjects
lcsh:Immunologic diseases. Allergy ,Allergy ,Immunology ,Ficus ,Case Report ,Immunoglobulin E ,medicine.disease_cause ,Cross-reactivity ,Microbiology ,Airborne allergen ,Allergen ,Food allergy ,medicine ,Immunology and Allergy ,Molecular Biology ,Fig ,Cysteine proteases ,biology ,business.industry ,Settore MED/09 - MEDICINA INTERNA ,medicine.disease ,Moraceae ,biology.organism_classification ,biology.protein ,business ,lcsh:RC581-607 - Abstract
Background Ficus carica is an edible fruit, belonging to the Moraceae family, rarely described as cause of food allergy. We describe the first case of fig allergy that occurred as a cross-reactivity between fig and Derp 1. Case presentation We present a case of a 10-years-old-girl, with a history of no-seasonal mild intermittent rhinitis, who experienced an immediate reaction after ingestion of a fresh fig. Skin prick tests (SPT) with commercial extracts of food, airborne allergens, latex and panallergens (profilin, PR-10 and lipid transfer protein) were performed. SPT revealed a sensitization only for dermatophagoides farina and dermatophagoides pteronyssinus which was then confirmed with by specific IgE assay (UniCAP, Phadia, Uppsala, Sweden). We also carried out a positive SPT with a commercial fig allergen (Lofarma, Milan, Italy) and prick-by-prick (PBP) both with skin and pulp of green raw and cooked fig. Fig specific serum IgE levels were 1.08 U/ml and specific IgE for rDer p1 was 16.20 U/ml (total serum IgE = 377 U/ml). In contrast specific IgE levels for latex, LTP, profilin, PR-10 and pollen allergens were negative. Conclusion The ficin, the major fig allergen, belongs to cysteine protease family like Der p 1. The symptoms presented by our patient could be related to a cross reactivity between these two proteins which present a structural homology.
- Published
- 2020
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