A double-blind, parallel group, placebo controlled multi-site trial of the clinical efficacy of 3 intralymphatic injections with a low dose of grass pollen extract into inguinal lymph nodes in grass pollen allergic subjects.~Primary endpoint is the difference in combined symptom and medication score during grass pollen seasons following treatment compared with patients receiving placebo.~Injections are giving ultrasound-guided with at least 4 weeks intervals.
Investigation of the clinical efficacy of 3 intralymphatic injections with grass pollen extract into inguinal lymph nodes on combined symptom-medication scores during grass pollen season in grass pollen allergic patients compared to placebo