FIG 1.
Swine primary and immortalized cells permit SIV replication. Relative influenza M gene expression at 12 h (open) and 24 h (filled) bars are shown for H1N1-NC (a), H1N2-NC (c), H1N1-MN (e), and H3N2-NC (g). Viral titers (log10) at 24 hpi for H1N1-NC (b), H1N2-NC (d), H1N1-MN (f), and H3N2-NC (h) are shown. Data represent mean ± standard error of the mean (SEM) of three replicates for M gene or plaque numbers at 24 hpi on MDCK cells. *, P < 0.05. Statistical methods used to determine significance are described in detail in Materials and Methods.