The project focuses on the development of new veterinary products for the treatment of bacterial diseases of fish, bees and inflammation of the mammary gland in cattle using specific bacteriophages for specific pathogens. The result of the project will be the development of a suitable and effective method for the preparation of specific phages by replication on specific bacteria, their identification and quantification and processing by purification processes and the development of a suitable dosage form of a medicinal product so that they can be used as drugs. The aim of the project is to build a pilot plant for the production of new medicinal products.