用聚合豚草变应原(PRW)进行花粉症的免疫治疗具有安全和有效的特点。本研究的目的是探讨P RW 的疗效可维持多久,在以后是否还需要进行短期的补充注射以巩固其疗效。试验对象为42名曾用P RW 治疗过一疗程(15次注射)的患者,接受注射总量为50,000PNU(蛋白氮单位)。42例中,21例在豚草季节前给予4周P RW 注射,剂量由第一次的2.5μgAgE(豚草花粉的主要致敏成分——摘者注)渐 The immunization of hay fever with polymerized ragweed allergen (PRW) is safe and effective. The purpose of this study was to investigate how long the duration of P RW can be maintained and whether subsequent short-term supplementary injections are needed to reinforce its efficacy. Forty-two patients who had been treated with P RW for a course of treatment (15 injections) received a total of 50,000 PNU (protein nitrogen units). Of the 42 patients, 21 were given P RW 4 weeks prior to the ragweed season at a dose of 2.5 μgAgE (Ratios of Ragweed Pollen)