TY JOUR TI ANALYSIS OF THE EPIZOOTIC SITUATION AND MEASURES TO PREVENT AVIAN INFLUENZA OUTBREAKS IN THE KALUGA REGION KW avian influenza KW epizootic situation KW avian influenza monitoring KW antigenic drift KW antigenic shift KW reassortment KW gulls KW avian influenza prevention KW vaccination JO Bulletin of KSAU AU Bondarev, A.Y. AU Vodolazov, E.A. AU Kuznetsov, A.N. PY 2026 IS 0 PB Krasnoyarsk State Agrarian University