Allergic Sensitization to Ragweed and Orchard Grass Pollens among Chinese Schoolchildren : An Epidemiological Study in Jiangsu Province

  • CHENG Lei
    International Research Centre for Nasal Allergy, Nanjing Medical University and Department of Otorhinolaryngology, The First Affiliated Hospital of Nanjing Medical University:Department of Health Promotion and Human Behaviour, Kyoto University Graduate School of Public Health
  • NAKAYAMA Meiho
    Department of Otolaryngology, Aichi Medical University
  • SHI Hai Bo
    International Research Centre for Nasal Allergy, Nanjing Medical University and Department of Otorhinolaryngology, The First Affiliated Hospital of Nanjing Medical University:Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University
  • YIN Min
    International Research Centre for Nasal Allergy, Nanjing Medical University and Department of Otorhinolaryngology, The First Affiliated Hospital of Nanjing Medical University:Department of Otorhinolaryngology, Akita University School of Medicine
  • MAO Xiao Quan
    Department of Health Promotion and Human Behaviour, Kyoto University Graduate School of Public Health
  • YAMASAKI Akiko
    Department of Health Promotion and Human Behaviour, Kyoto University Graduate School of Public Health
  • SAMBE Takeyuki
    Department of Otolaryngology, Showa University Fujigaoka Hospital
  • ENOMOTO Tadao
    Department of Otolaryngology, Japanese Red Cross Society Wakayama Medical Center
  • SAHASHI Norio
    Department of Biology, Faculty of Pharmaceutical Sciences, Toho University
  • SHIRAKAWA Taro
    International Research Centre for Nasal Allergy, Nanjing Medical University and Department of Otorhinolaryngology, The First Affiliated Hospital of Nanjing Medical University:Department of Health Promotion and Human Behaviour, Kyoto University Graduate School of Public Health
  • MIYOSHI Akira
    International Research Centre for Nasal Allergy, Nanjing Medical University and Department of Otorhinolaryngology, The First Affiliated Hospital of Nanjing Medical University

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Other Title
  • 中国江蘇省の小, 中, 高校生におけるブタクサ・カモガヤ花粉への感作に関する疫学研究

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Allergic diseases including pollinosis have become a global issue of public health. However, little is known about the prevalence of pollen-related allergy in the Chinese population. During 1996 to 1999, we performed an epidemiological study on nasal allergy among schoolchildren (911 males and 750 females) aged 6 to 16 years in Lili Town, Wujiang City, Jiangsu Province, China. The cross-sectional observation between 1996 and 1998 showed that the prevalence of allergic sensitization (positive allergen skin reactions) to ragweed and orchard grass pollen was 6.3% and 3.9%, respectively, and the overall rate of sensitization to at least one kind of these two pollens was 8.7%. The positive rate of skin reactivity was significantly higher among 15 to 16-year-old students than that among 6 to 7-year-old students (13.6% vs. 7.4% ; OR=1.99, 95% CI 1.26∿3.12). In addition, we observed a remarkable increase in the prevalence of sensitization to ragweed and/or orchard pollens from 2.8% in 1996 to 14.0% in 1998 among all participating subjects (OR=5.76, 95% CI 3.25∿10.22). This increasing trend was more significant in the prevalence of sensitization to ragweed pollen (OR=9.24, 95% CI 4.23∿20.19). Subsequent vertical-sectional observation showed that 5.8% of children with initially negative skin reactivity to ragweed and/or orchard grass pollens in 1996 had become positive three years later. Data from cross-sectional study carried out in 1996∿1998 showed that the prevalence of pollinosis due to ragweed and/or orchard grass pollens was 1.1% among all of the participants. Further longitudinal observation is needed to find out time trends in pollinosis among those schoolchildren with positive allergen skin reactions. In this paper, we also discussed the methods of epidemiological study for pollinosis.

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