TABLE 4.

CNS viral titers

Virus	Time (wk) postinfection	Avg CNS titer (PFU/g)
		Brain	Spinal cord
pDA	1	6.3 × 105	8.2 × 104
	2	4.3 × 104	8.1 × 105
	4	5.0 × 104	5.0 × 105
	8	1.1 × 104	1.1 × 105
T81V	1	3.7 × 105	2.4 × 105
	2	4.8 × 104	2.5 × 105
	4	1.2 × 105	6.3 × 104
	8	1.2 × 104	1.0 × 104a
T81W	1	1.3 × 105	9.8 × 104
	2	5.3 × 103	3.6 × 104
	4	7.9 × 103a	8.5 × 104
	8	1.5 × 103a	3.0 × 103b
T81D	1	3.5 × 103a	2.7 × 103b
	2	4.2 × 101a	1.7 × 101b
	4	0	0
	8	6.7 × 102a	0
V91T	1	5.1 × 104	0
	2	9.3 × 102	0
	4	2.5 × 102	0
	8	9.0 × 103b	0

^aOne mouse of three contained no infectious virus. 

^bTwo of three mice contained no infectious virus.