TY JOUR TI BETULINIC ACID AMIDE EFFECT ON THE IMMUNE STATUS OF GUINEA PIGS INFECTED WITH BLV KW guinea pigs KW bovine leukemia virus KW immunofluorescence assay KW immune status KW betulinamide KW antiviral activity JO Bulletin of KSAU AU Novikova, N.N. AU Barmina, K.A. AU Vlasenko, V.S. AU Vishnevsky, E.A. PY 2026 IS 0 PB Krasnoyarsk State Agrarian University