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<p>The nasal allergen challenge (NAC) is a valuable diagnostic tool for both clinicians and researchers in the field of allergy and its management. In Europe, an aqueous extract Aquagen SQ (ALK-Abelló) was historically the most widely used solution for this purpose. Its production ceased in 2019, creating a gap in available resources. This clinical trial evaluated the feasibility of using dissolved birch pollen tablets, ITULAZAX 12-SQ Bet (ALK-Abelló) tablets as an alternative for NAC. A total of 69 participants with confirmed birch pollen allergy and 20 healthy controls underwent NAC using either dissolved ITULAZAX, dissolved placebo tablets, or a 0.9% saline solution. The primary objective was to assess the sensitivity of NAC with dissolved ITULAZAX. The method demonstrated a sensitivity of 96% and a specificity of 95%. These findings support the use of dissolved ITULAZAX as a reliable and accessible allergen source for nasal allergen challenges in both clinical practice and research.</p>

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Nasal allergen challenge with dissolved birch tree pollen tablets

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月10日

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  • Eirini Paziou,
  • Karin Jamil Ali,
  • Susanna Kumlien Georén,
  • Agneta Karlsson,
  • Emma Nilsson,
  • Laila Hellkvist,
  • Lars Olaf Cardell

摘要

The nasal allergen challenge (NAC) is a valuable diagnostic tool for both clinicians and researchers in the field of allergy and its management. In Europe, an aqueous extract Aquagen SQ (ALK-Abelló) was historically the most widely used solution for this purpose. Its production ceased in 2019, creating a gap in available resources. This clinical trial evaluated the feasibility of using dissolved birch pollen tablets, ITULAZAX 12-SQ Bet (ALK-Abelló) tablets as an alternative for NAC. A total of 69 participants with confirmed birch pollen allergy and 20 healthy controls underwent NAC using either dissolved ITULAZAX, dissolved placebo tablets, or a 0.9% saline solution. The primary objective was to assess the sensitivity of NAC with dissolved ITULAZAX. The method demonstrated a sensitivity of 96% and a specificity of 95%. These findings support the use of dissolved ITULAZAX as a reliable and accessible allergen source for nasal allergen challenges in both clinical practice and research.