Emergence of pollen food allergy syndrome in asthmatic children in Paris

International audience; BackgroundOver the last few decades, the level of pollen from birch and homologous trees has increased in parts of Europe. Sensitization to birch pollen allergens (principally Bet v 1) has been associated with food cross‐reactivity called pollen‐food‐allergy syndrome (PFAS).ObjectiveTo evaluate changes in allergic diseases due to IgE sensitization over 25 years in asthmatic children.MethodsThis was a cross‐sectional retrospective study conducted in Paris. We analyzed two cohorts of asthmatic children with similar characteristics explored between 1993‐1999 (old cohort=OC) and 2012‐2018 (recent cohort=RC).Results121 children were in the OC and 120 in the RC. An increase in sensitization to tree pollens was found especially for birch pollen which was 11.6% in the OC and 31% in the RC (p=0.0002). Allergic rhinitis prevalence was significantly higher in the RC than in the OC (96% vs 52%, respectively, p