TABLE 6.

Cross-reactivity of postinfection mouse sera against selected H2 viruses in a neutralization assay^a

Virus	Titer of mouse serum in neutralization assay
	Jap/57b	Kras/59b	AA/6/ 60	Berlin/64	Berk/68	pin/Prai/ 76	mal/NY/ 78b	mal/Pot/ 83b	ck/ NY/91	dk/ Hok/01	mal/ Alb/02	tern/ Aus/04	dk/ Hok/05	dk/ Mng/06	sw/MO/ 06b
Jap/57	320	32	20	226	40	28	202	202	113	80	226	10	10	20	381
Kras/59	254	80	20	40	10	32	254	226	10	80	101	40	320	254	453
AA/6/60	101	80	50	113	453	10	40	32	10	10	10	16	40	10	16
Berlin/64	32	320	16	202	40	10	10	16	20	16	28	28	10	57	10
Berk/68	20	320	10	226	453	10	10	10	10	10	16	10	10	25	10
pin/Prai/76	160	80	10	40	10	57	113	63	10	57	80	10	320	254	453
mal/NY/78	202	320	10	10	10	20	226	127	10	80	254	10	453	32	202
mal/Pots/83	254	160	10	16	10	25	202	113	10	50	50	10	202	63	226
ck/NY/91	127	127	10	28	10	40	160	113	226	50	226	20	226	63	806
dk/Hok/01	160	127	10	32	10	16	202	113	101	113	101	10	135	63	640
mal/Alb/02	202	63	10	16	10	28	160	101	10	32	254	10	67	127	508
tern/Aus/04	101	63	10	16	10	10	63	32	10	20	63	113	67	127	50
dk/Hok/05	805	113	25	127	16	50	453	113	16	202	226	226	160	226	1,280
dk/Mng/06	320	320	10	63	20	50	226	160	202	101	160	10	320	2,032	640
sw/MO/06	160	127	10	16	16	25	127	101	28	101	101	10	160	113	806

^aHomologous titers are in bold; 4-fold-or-greater differences in titer are underlined. The lower limit of detection was assigned a value of 10. Mouse antisera were generated against the viruses indicated.

^bAntiserum with cross-neutralizing antibody to the greatest number of heterologous H2 subtype influenza viruses.