Around one in 3,300 children in Germany is born with mucoviscidosis. A characteristic of this illness is that one channel albumen on the cell surface is disturbed by mutations. Thus, the amount of water of different secretions in the body is reduced, which creates a tough mucus. As a consequence, inner organs malfunction. Moreover, the mucus blocks the airways. Thus, the self-regulatory function of the lung is disturbed, the mucus is colonized by bacteria and chronic infections follow.