Phleum pratense molecular pattern across Italy.

Summary Introduction. Phleum pratense (Timothy grass) is the most frequent cause of grass allergy in Europe. Molecular-based allergy diagnostics have been recently introduced in the clinical practice, allowing to define and characterize exactly the sensitization profile. Aim of the study. The present study was aimed to investigate the possible relationships between Graminaceae pollen data and the pattern of IgE reactivity to different allergen components across Italy. Methods. Pollen data, including duration and quantity, were recorded over a 10-year period in 24 Italian centres located along the Italian peninsula. Phl p molecular patterns (Phl p 1, 5, 7, 12) were evaluated in 4 different Italian geographical areas. Results. There were significant differences about pollen count and sensitization prevalence across Italy. Different molecular patterns were defined considering the different Italian locations. Conclusion. This study demonstrates that Phleum pratense sensitization is relevant in Italy, but there are significant geographical variations variations as far as pollen exposure and pattern of IgE reactivity to the considered allergen components are concerned. This information may have clinical relevance in managing patients allergic to grass pollen.