TY JOUR TI INFECTIOUS AND PARASITIC AGENTS AS POTENTIAL SOURCES OF PIG MANURE CONTAMINATION KW pigs KW bacteria KW vimses KW invasion KW disease KW infection KW manure contamination JO Bulletin of KSAU AU Stroganova, I.Y. AU Donkova, N.V. PY 2015 IS PB Krasnoyarsk State Agrarian University