Figure 2From: Enhanced replication of avian-origin H3N2 canine influenza virus in eggs, cell cultures and mice by a two-amino acid insertion in neuraminidase stalk Plaque morphology of r-06 and r-06/NA2 strains grown in MDCK cell monolayers. Cells were infected at an MOI of 0.001 and cell monolayers were fixed with formaldehyde at 72 h post-infection and stained with 1% crystal violet.Back to article page