Figure 4From: Duck plague virus tegument protein vp22 plays a key role in the secondary envelopment and cell-to-cell spread The effect of UL49 gene on virus adsorption, invasion, replication and release. The number of plaques in virus-infected cells was counted to determine the effect of the UL49 gene on virus A adsorption and B endocytosis. DNA was extracted from virus-infected cell samples and the copy number was assayed to determine the effect on C virus replication. The effect of the UL49 gene on D virus release can be determined from the TCID50 of the supernatant source samples (**P < 0.01; ∗P < 0.05).Back to article page