TABLE 4.

Cross-reactivity of neutralizing-antibody responses for H5N1 group A and B viruses

Serum	Subgroup of virus isolate	Neutralizing-antibody titer in serum
		HK/156 (A)	HK/486 (A)	HK/485 (B)
Humana
A	A	160	160	160
E	A	640	1,280	320
L	A	640	1,280	640
C	B	640	2,560	1,280
D	B	1,280	1,280	640
F	B	40	80	80
K	B	320	320	80
Ferret reference
Anti-HK/156	A	3,200	12,800	3,200
Anti-HK/488	A	6,400	6,400	3,200
Anti-HK/483	B	12,800	12,800	12,800
Anti-HK/485	B	3,200	6,400	3,200

^aHuman S2 serum samples.