Fig. 4From: Construction and sequencing of an infectious clone of the goose embryo-adapted Muscovy duck parvovirus vaccine strain FZ91-30Pathogenic changes of the embryo died at day 7 post-transfection of pFZ (a), and haemorrhagical lesions in the head, neck, embryonic body, and legs were observed. In the control group (b), no pathogenic change was observed in the embryo which survived in transfection of the vector plasmid pBSKN till the 12th dayBack to article page