Bisschop, S.P.R. (Shahn); Peters, Andrew; Domingue, Gil; Pearce, Michael C.; Verwey, Jeanette; Poolman, Petrus
(F1000Research, 2021-12)
BACKGROUND : This study determined whether the naturally attenuated, thermotolerant Newcastle disease vaccine virus I-2 could acquire virulence after five in vivo passages through SPF chickens. METHODS : Study design was ...