This project aims to explore probiotic strategies that can reduce infections of the upper respiratory tract ( '' upper respiratory tract, '' URT) efficiently. For this purpose will be established a platform (1) to select new probiotic strains for this innovative niche (2) to design innovative processes for the formulation, scaling and applying to develop innovative test these probiotic strains (3) based on cellular, more complex polymicrobial systems and microbioanalysen of the URT. Allows the impact of probiotics will, other diet-related components and pharmaceuticals on the microbiota of the URT can be studied.