Differential virus growth kinetics in three MDCK cell lines.

<p>MDCK-lineage cell lines were infected βy epidemic H1N1 (A), pandemic H1N1 (B), H3N2 (C-E), and influenza B strain (F) with a M.O.I. of 0.01. Supernatant were collected at 24, 48, 72, and 96 hours post-infection. Viral titers were determined by Immunostaining Plaque Assay with MDCK-London cells. N.D. indicates Not Detectable. Data expressed as means ± SEM of three experiments in each group. *<i>p</i> <0.05, **<i>P</i><0.01, ***<i>p</i><0.001.