Table 1.

VV Δ F2L-gfp exhibits virulence characteristics that are similar to the parent virus.

Virus (PFU/mouse)a	Mortality		MDDb
	Number	Percent
VV-WR, UAB
1.6 × 104	10/10	100	6.8 ± 0.8
1.6 × 103	3/10	30	8.3 ± 0.6
1.6 × 102	0/10	0	---
16	0/10	0	---
1.6	0/10	0	---
VV-WR, Turner
Stock 1.6 × 108	10/10	100	3.2 ± 0.4
1.6 × 107	10/10	100	3.9 ± 0.3
1.6 × 106	10/10	100	5.1 ± 0.3
1.6 × 105	10/10	100	6.2 ± 0.4
1.6 × 104	10/10	100	7.9 ± 1.0
VV Δ F2L-gfp
Stock 6 × 107	10/10	100	4.2 ± 0.4
6 × 106	10/10	100	4.7 ± 0.5
6 × 105	10/10	100	6.1 ± 0.6
6 × 104	10/10	100	7.1 ± 0.3
6 × 103	5/10	50	8.4 ± 0.5

a. Anesthetized mice were inoculated intranasally with 40 μl of virus (20 μl/nostril).

b. Mean day of death (MDD) is shown with the standard deviation.