Table 3. H1 analysis of ΔH5 recombinant viruses with anti-H5 monoclonal antibodies.

	Monoclonal antibodies to H5 (H1 titers)
Virus	VN04-6*	HK03-3†	CP24‡	CP46‡	CP58‡	406/7‡
ΔH5N1/03	51,200	6,400	1,600	100	1,600	800
ΔH5/04	12,800	<100	800	<100	1,600	<100
ΔH5S155→N, T156→A/04	3,200	<100	800	<100	800	100
ΔH5S120→N/04	12,800	200	800	<100	1,600	<100
ΔH5R212→K/04	12,800	100	1,600	<100	6,400	<100
ΔH5S223→N/04	51,200	3,200	12,800	<100	25,600	<100
ΔH5S120→N, S155→N, T156→A/04	12,800	1,600	3,200	<100	1,600	200
ΔH5N223→S/03	12,800	800	≤100	<100	200	≤100

H1 tests were performed in microtiter plates with 0.5% chicken RBCs. Titers are the reciprocal lowest dilutions of mAbs that inhibited hemagglutination caused by 4 HAUs of virus.

^*Anti-HA mAb to A/Vietnam/1203/04 virus.

^†Anti-HA mAb to A/HK/213/03 virus.

^‡Anti-HA mAb to A/chicken/Pennsylvania/1370/83 virus.