TABLE 1.

Hemagglutination inhibitory activity against rA/PR/8/34 and X31 viruses of sera from mice immunized with nine-segment viruses

Vaccine	Mouse	Titer against:
		rA/PR/8/34		X31
		Preimmune	Postvaccination	Preimmune	Postvaccination
PBS	1	<10	<10	<10	<10
	2	<10	<10	<10	<10
	3	<10	<10	<10	<10
	4	<10	<10	<10	<10
	5	<10	<10	<10	<10
−PB1(ps)+Luc	1	<10	160	<10	<10
	2	<10	320	<10	<10
	3	<10	160	<10	<10
	4	<10	320	<10	<10
	5	<10	320	<10	<10
−PB1(ps)+HK HA	1	<10	320	<10	20
	2	<10	640	<10	<10
	3	<10	320	<10	40
	4	<10	320	<10	20
	5	<10	320	<10	40