Immunobiotics mechanisms of action and prospects of use in veterinary medicine Aleksandr Refeld, Anna Bogdanova, Evgeniya Prazdnova, Alexey Beskopylny, Anastasiya Olshevskaya, Tatyana Maltseva and Vladislav Zubtsov E3S Web Conf., 210 (2020) 06017 Published online: 04 December 2020 DOI: 10.1051/e3sconf/202021006017