TY JOUR TI VIRULENCE OF STRAINS/ISOLATES OF PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME VIRUS TYPE 1 KW PRRS virus KW virulence KW clinical signs KW viremia KW pathological changes KW monoinfections KW coinfection JO Bulletin of KSAU AU Vlasov, M.E. AU Lunicyn, A.V. AU Pronin, V.V. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University