In recent years, the serious infectious disease of the bee ‘Mor bee fetus’ (AFB), caused by the disputed bacterium Peanibacillus larvae (PL), has spread worldwide. Since the use of antibiotics in the production of bee products is legally prohibited, there is no effective product in the Czech Republic to control this disease. An interesting, forward-looking and progressive alternative in the treatment of bacterial diseases appears to be preparations based on phages and phage endolyzines.