Conclusion: We suggest 3 years of sublingual immunotherapy for patients with perennial allergic rhinitis who require immunotherapy and do not accept the subcutaneous route of allergen administration.

• 结论：我们建议对常年变态反应性鼻炎患者进行三年舌下免疫治疗，这些患者需要免疫治疗并且不接受皮下注射变态反应原的给药方式。