Fig. 3From: The M, F and HN genes of genotype VIId Newcastle disease virus are associated with the severe pathological changes in the spleen of chickensGrowth curves of the viruses. The growth kinetics of the parental and recombinant viruses was assessed by a multistep growth assay in DF1 cells. Each virus was inoculated at MOI of 0.001 into DF1 cells and the cell supernatant was collected at every 12Â h until 60Â h p.i. for titrationBack to article page