FIELD: biotechnology.SUBSTANCE: group of inventions relates to biotechnology. Method for combating the proliferation of the Naegleria fowleri and the use of a disinfecting agent is provided. Method involves adding a strain of Willaertia magna, deposited with the number PTA 7824 in the ATCC, or the strain Willaertia magna, deposited with the number PTA 7825 in the ATCC, into the flow of liquid or gas or onto a solid surface. Disinfecting agent contains a strain of Willaertia magna, deposited with the number PTA 7824 in the ATCC, or a strain of Willaertia magna, deposited with the number PTA 7825 in the ATCC, in the form of an aqueous solution or suspension used as a biocidal agent against Naegleria fowleri to treat a gas or liquid stream or a solid surface.EFFECT: inventions provide control over the proliferation and contamination of Naegleria fowleri.5 cl, 5 dwg, 1 tbl
