Stallergenes Greer and Anergis announced the results of a joint research study evaluating the effects of second-generation Contiguous Overlapping Peptides (COP) allergen immunotherapy in a therapeutic model of birch pollen allergy, with the aim of shortening AIT administration schemes. COP-Virosomes, COP alone and virosomes alone were compared to a placebo group in an in-house therapeutic model of birch pollen allergy. Recombinant Bet v 1 alone (the major allergen of birch pollen) and natural birch pollen allergen extract were also used as controls in this setting. COP-virosomes were the only synthetic therapy able to fully reverse asthma symptoms as well as lung inflammation (i.e. significant reduction in eosinophils in bronchial fluids). Pro-allergenic immune responses also decreased with COP-virosomes therapy with a significant decrease of the IL-4, a Th2 cytokine. The results of the study will soon be published.