Table 2.

Viral titers of the mouse lungs at 5 and 14 days p.i. with WT or M2^a

Day p.i.	Inoculum	Mean viral titer (log10 PFU/g ± SD)
5	DMEM	0
5	M2	0
5	WT	4.94 ± 0.56
14	DMEM	0
14	M2	0
14	WT	0

^aEight mice in each group were inoculated with DMEM (negative control) or the WT or M2 virus. The viral titer was measured by florescent plaque assay at 5 and 14 days p.i. If the viral titer was 0, the minimum detectable titer was assigned for the statistical analysis. P < 0.001 for the M2 and DMEM group versus the WT group; P = 1 for the DMEM group versus the M2 group. All P values were determined by one-way ANOVA. The limit of detection was 100 PFU/g.