Sensitization profiles in polysensitized patients from a restricted geographical area: further lessons from multiplexed component resolved diagnosis

Eur Ann Allergy Clin Immunol VOL 43, N 6, 171-175, 2011 R.E. Rossi 1, G.Melioli 2, G.Monasterolo 3, C. Harwanegg 4, L. Rossi 2, G.W. Canonica 5, G. Passalacqua 5

1Rete di Allergologia Regione Piemonte, Azienda Sanitaria Cuneo 1, Cuneo, Italy, 2Laboratorio Centrale di Analisi, Istituto Giannina Gaslini, Genoa, Italy, 3Laboratorio Analisi Ospedale di Savigliano e Fossano, Azienda sanitaria Cuneo 1, Cuneo, Italy, 4Genosense, Vienna, Austria, 5Allergy and Respiratory Diseases, University of Genoa, Italy



Background: The micro-array techniques for the detection of specific IgE has improved the diagnostic procedures for allergic diseases. This method also allows to define sensitization profiles from an epidemiological point of view. We studied the sensitisation pattern in a population of polysensitized patients with respiratory allergy, living in a restricted geographical area in the north-west Italy.

Methods: Consecutive patients with asthma/rhinitis, living in the province of Cuneo, and having at least two positive skin prick test for non related aeroallergens were studied by a microarray (Phadia, Milan Italy) which allowed to detect specific IgE against 103 different allergen components.

Results: The 70 patients included had specific IgE towards a mean of 4.3 allergens/patient (range 2-12 allergens). Concerning pollens, 63 (90%) had specific IgE to at least one genuine grass pollen allergen, 32 (45.7%) had Ole e 1 specific IgE antibodies, although olive tree is not present in the area. A relevant percentage of sensitization to mite was found (47,1%). True co-sensitisation to grass-pollen allergens/Bet v 1/Ole e 1 was observed in 15 individuals (21.4%). Pru p 1, resulted to be a sensitizing allergen in 23 patients (32.85%), 4 of whom were co-sensitised to Pru p 3 and/or Art v 3.

Conclusion: A detailed knowledge of the sensitisation pattern may have relevant implications for the prescription of specific immunotherapy. Moreover, sensitisation to PR-10 (or profilin), frequently associated to oral allergy syndrome, in some cases could hide the sensitisation to LTPs which are clinically more relevant.