Table 1.

Growth of KOS, hr74, C166A, and C254A on Vero and UL6-31 cells^a

Cell line	Virus growth (PFU/ml)
	KOS	hr74	C166A	C254A
Vero	1.9 × 108	1.6 × 103	4.5 × 102	1.2 × 103
UL6-31	1.0 × 108	7.5 × 107	1.6 × 107	3.1 × 107

^aVirus yields were determined by infecting Vero or UL6-31 cells at an MOI of 0.5 PFU/cell and collecting samples 24 h postinfection. Viral titers were determined on the permissive UL6-31 cell line.