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Towards a global vision of molecular allergology: a map of exposure to airborne molecular allergens.

Allergy diagnostics have changed in the last 10-15 y, moving from the use of extracts for in vivo and in vitro diagnosis to the Component Resolved Diagnosis, based on purified or recombinant allergens. As expected, aerobiology developed similarly, and measurement of allergens in both outdoor and indoor air is now feasible. With the aim of promoting a global view of molecular allergy, we have drawn a map of exposure to molecular aeroallergens in Italy on the bases of geo-climatic regions, maps of pollen distribution, and published data on the molecular profile of sensitization in Italian patients. Given the latitudinal extension of Italy, the profile of exposure to some allergens, such as those of the "Birch Group" and weeds, varies greatly from North to South, while the distribution of exposure to grass allergens is more homogeneous. This map can contribute to a global molecular vision of allergy, helping clinicians to view exposure to pollen in a new way. The exposure profile of the area where patients live can also indicate the correct choice of molecular diagnostics and, therefore, of the appropriate allergen immunotherapy.