TABLE 2.

WSN virus growth determined by HA assay

Fibroblast culture	Virus titera
	48 h	60 h	72 h	84 h
WT cell line	<2	<2	<2	<2
WT MEFs	<2	<2	<2	<2
STAT1−/− cell line	<2	8	16	32
STAT1−/− MEFs	16	32	64	ND
IFNγ−/− MEFs	<2	<2	<2	<2
IFNαR−/− MEFs	32	64	64	64

^aCell monolayers were infected with WSN virus at an MOI of 0.001 and incubated at 37°C. At the indicated time points, the amount of virus in the supernatant was determined by HA assay. At 12, 24, and 36 h p.i., titers in all cultures were <2. ND, not done.