Funding: the study was conducted as part of the State Assignment of the Federal Medical Biological Agency of Russia (GK № 42.001.22.6).

Author contribution: Yarkov SP — concept, part in developing the “Zondazh” unit, planning the experiments and analysis of the results, manuscript draft; Tretyakov SI — developing immunochromatography tests, experiments with dairy products, analysis of the study results; Shilenko IV — developing immunochromatography tests, experimental procedure, analysis of the results; Ishkov YuN — day-to-day research management, manuscript editing; Styazhkin KK — general management, manuscript editing.