SHIVIG was tested at 0.5 mg/ml, except where noted. aNeutralization obtained with 1 mg/ml of SHIVIG. bAn HIV-positive serum pool was used as positive control, except as indicated. cBnmAb VRC01 (50 μg/ml) was used as positive control. IMC, infectious molecular clone. All neutralization assays were performed at least in duplicate.