The importance of hornbeam (Carpinus sp.) pollen hypersensitivity in spring allergies

Hornbeam (Carpinus sp.) flowering occurs generallysimultaneously with birch anthesis. While birch pollenis known as the major tree-allergen in central andnorthern Europe, the quantitative and qualitative roleof hornbeam pollen in allergy has not been evaluated.In some regions of Switzerland, the annual ratiohornbeam SPI / birch SPI reaches 20–30% on average,and 50–180% some years. The relative importance ofhornbeam pollen hypersensitivity has been evaluated inmore than 200 patients suffering from spring allergiesto pollen during the last five years (1993–1997) inthe region of Geneva. Among symptomatic patientsduring the March-April period, 73.5% werehypersensitive to Betulaceae pollen. Overall, 71.7%of the patients allergic to Betulaceae pollen werefound to be sensitive to hornbeam, and 12.5% of thesame group of patients were sensitive to hornbeampollen only. Among this last group, half of thepatients, besides allergic rhino-conjunctivitis, werealso suffering from asthma. Hornbeam pollen isabundant and appears to have a significativeimportance in spring allergies. In some cases,specific immunotherapy to hornbeam pollen shouldperhaps be considered.