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SHIVHXB2 neutralizing antibody titers in the sera of infected macaques. Neutralization of SHIVHXB2 was measured in MT2 cells in the presence of sera from groups A, B, C, D, and naive macaques collected on 2, 4, and 8 weeks after rectal inoculation with SHIVKU2. The lowest dilution of serum tested was 1:10. The results are expressed as dilutions of serum inhibiting 50% of infection in MT2 cells and are expressed as mean titers ± the standard errors from animals of each group.
