Table 2.

Percentage of inhibition of cH5/1-pseudotyped particle entry using a purified IgG preparation from pooled sera

IgG concn (μg/ml)	% inhibition with:
	NC99-Cal09a	NC99-SI06b	Cal09c	6F12d	Naïvee
50	92.0 ± 4.2	97.3 ± 0.9	9.0 ± 12.8	99.8 ± 0.0	0 ± 0
10	50.5 ± 8.8	64.3 ± 3.1	14.3 ± 4.5	97.5 ± 0.6	10.1 ± 14.3
2	0.5 ± 0.7	33.8 ± 19.9	8.0 ± 9.3	84.8 ± 5.4	4.1 ± 5.8

^aPurified IgG from mice primed with 10⁴ PFU of A/New Caledonia/20/99 virus (NC99) and then boosted 4 weeks later with 10³ PFU of A/California/04/09 (Cal09) virus.

^bPurified IgG from mice primed with 10⁴ PFU of A/New Caledonia/20/99 virus and then boosted 4 weeks later with 10⁵ PFU of A/Solomon Islands/3/06 (SI06) virus.

^cPurified IgG from mice infected with 10⁴ PFU of A/California/04/09 virus.

^dStalk-specific monoclonal antibody 6F12 used as a positive control.

^ePurified IgG from naïve mice.