[Identification of the allergenic taxa of pollen in patients with pollinosis to determine the risk season].
BACKGROUND: Determining the risk season for the presence of pollen in the atmosphere aids primary care physicians in the diagnosis and treatment of allergic diseases. Our objective was to identify the taxa of pollen that cause allergic rhinoconjunctivitis in a sample of patients from a health center who presented seasonal symptoms. METHODS: We designed an observational, cross-sectional, non-randomized study to be carried out in the Cazoña Health Center in Santander, Spain. We selected 30 volunteers of both sexes, aged between 13 and 69 year old, who suffered seasonal rhinoconjunctivitis symptoms and who had always lived in Santander. Patients underwent skin-prick tests with the 25 pollen extracts routinely used in Spain, house dust mite (HDM), cat dander and Alternaria extracts by means of the Prick-Film system. The test result was expressed as the percentage of the papule area caused by histamine. Measurement was performed by scanning the copied papule area with the Prick-Scan program for PC. RESULTS: All patients were positive to grass pollen, 26 % were sensitized to grass pollen only and 23 % were also sensitized to other non-pollen allergens. Twenty-seven percent tested positive to Plantago, 20 % to Quercus and 13 % to Morus; the remaining pollen extracts were positive in less than 10 %. Fifty-six percent of the patients were positive to HDM and 6 % to cat dander. CONCLUSIONS: A warning period for pollinosis patients in the city of Santander can be defined. In our case, the important period is the grass pollen season, since the remaining pollen taxa sensitized few patients. Most of our patients were also sensitized to HDM.