Sensitisation to Lep d 2- Lepidoglyphus destructor allergy in asthma and rhinitis

<b>Background.</b> Mites are responsible for allergic diseases, such as asthma and rhinitis, in nearly 1.5% of the world population. It is known that nowadays, besides House Dust Mites (HDM), Storage Mites (SM) are important sensitisers in urban non-occupational dwellings, predominantly in the Mediterranean area. The main objective of our study was to analyse the clinical relevance of the most prevalent SM, <i>Lepidoglyphus destructor</i>, by assessing the relationship between sensitisation to the major molecular allergen Lep d 2 and allergic respiratory disease phenotype in an urban population monosensitised to this molecular allergen. <b>Methods.</b> Cross-sectional study which included consecutive patients evaluated in our Allergy Department between 2012 and 2018, from urban non-occupational setting, with rhinitis and/or asthma, perennial symptoms and proven sensitisation to SM Lep d 2, tested using ImmunoCAP Immuno Solid-phase Allergen Chip (ISAC) technology, which detects 112 allergens. <b>Results.</b> A total of 37 allergic patients were included (23 female), aged 20.1 ± 12.8, min-max 5-58 years-old. The molecular sensitisation profile showed 18.9% of <i>L. destructor</i> mite monosensitised patients, having only sIgE to Lep d 2. This subset of patients mainly had allergic rhinitis, with 28.6% also being asthmatic. Regarding severity, most patients showed a persistent moderate phenotype of respiratory disease. The mean value of Lep d 2 sIgE was 8.3 ± 9.8 ISU-E, lower than in mite polysensitised patients (21.7 ± 21.5, p = 0.049). <b>Conclusions.</b> Our proof-of-concept study focused on Lep d 2 monosensitisation, showed that SM may have clinical relevance in perennial allergic asthma and rhinitis, and should be taken into account when assessing and treating allergic respiratory disease. <b>Conclusions</b>. The present survey demonstrated that Italian primary care pediatricians accomplish ARIA guidelines and adapt treatment on the basis of the intensity of symptoms. Corticosteroids and antihistamines are the most common prescribed medications. Nasal lavages are also popular.