Table 2. Hemagglutination inhibition assay (HAI) to measure receptor binding inhibition of mAbs against H5N1 influenza viruses (μg/ml).

	r97HKHA-PR8 (clade 0)		r04VNHA-PR8 (clade 1)		r06ZJHA-PR8 (clade 2)		PR8
4E6	0.39		0.19		12.5		N
4D5	>100		25		0.8		N
1H10	>100		>100		>100		N