A prerequisite for the life of microorganisms is the simultaneous presence of air, heat, and free moisture. Given this, sheep fleece is an ideal environment for their growth and development. The microflora of the fleece, during its lifecycle, utilizes both its environment, i.e. the wool grease, and keratin itself as substrates, which leads to damage to the fiber's structure and, in some cases, even to its complete degradation. Microbiological degradation of fibers is the most common type of wool damage [1,2].