Overview Phase II HDM-SPIRE Safety and Efficacy Study Status: Completed Trial end date: 2017-04-13 Target enrollment: Participant gender: Summary The purpose of this study is to compare the treatment effect of three treatment regimens of HDM-SPIRE vs placebo and to evaluates the treatment effect of HDM-SPIRE on symptoms, rescue medication usage, Quality of Life and Sleep Quality Phase: Phase 2 Details Lead Sponsor: Circassia LimitedCollaborator: Quintiles, Inc.