Involution of IgE sensitisation to House Dust Mite allergen molecules by age

Background: The evolution of mite sensitisation profiles from childhood to adulthood is associated with distinct clinical outcomes. Longitudinal sensitisation trajectories have never been addressed across two generations over an extended time frame. Using molecular diagnosis, we aimed to investigate how the evolution of mite sensitisation relates to the expression of rhinitis and asthma in adult versus paediatric patients over a 20-year period. Methods: Specific IgE (sIgE) to mite molecular allergens was determined using MeDALL allergen chip (Der p 1, 2, 4, 5, 7, 10, 11, 14, 15, clone 16, 18, 21 and 23; Der f 1, Der f 2, Lep d 2, Blot t 5). Assessment was made in adult (n=21), adolescent (n=11) and paediatric patients (n=19) with rhinitis and/or asthma, in T1 (20-years-ago) and in T2 (current time). Results: After the 20-year-period, the adult cohort significantly decreased the number of sIgE responses to mite components - T1: 7 [3-9] versus T2: 4 [2-6], median [IQR], p=0.0040. A strong negative correlation was observed between age and the 20-year variation of sensitisation count (r = - 0.5305; p