[Analysis on the allergic characteristics of humulus pollen in Beijing]

Objective:To understand the sensitization characteristics of humulus pollen in patients with allergic rhinitis or allergic asthma in Beijing, and to explore the proportion of the population allergic to humulus pollen. Methods:Selected 8380 patients who were diagnosed with allergic rhinitis, allergic asthma, and allergic rhinitis combined with asthma in outpatient clinic from January 2017 to December 2019. SPT test was performed with humulus allergen reagent to compare the sensitization distribution of humulus pollen by age and disease, and analyze the sensitization characteristics of humulus pollen. Results:The total positive rate of humulus pollen SPT reached 49.59%.The positive rate of humulus pollen SPT was the highest in the age group of 10 to 14 years old, reaching 71.98%, compared with other age groups, there was a statistical difference （P<0.01）; and the positive rate of SPT in patients under 10 years of age gradually increased with age, and the positive rate of SPT in patients over 50 years of age gradually decreased with age. Humulus pollen SPT positive patients ++++ and above accounted for 41.43%, which was significantly different from other groups （P<0.01）. Single humulus was less allergenic, accounting for about 23.87%. Most of them were combined with multiple pollen allergies （76.13%）, and often combined with chenopodiaceae pollen sensitization （92.81%）. Conclusion:The SPT positive rate of humulus pollen in patients with allergic rhinitis or asthma in Beijing area is nearly 50%. The positive rate of SPT is the highest among patients aged 10-14, and most of them show strong positive reactions. It is suggested that humulus pollen is the main allergen of allergic rhinitis and asthma, and the sensitization of humulus pollen tends to be multiple allergens.