TABLE 3.

Neutralization of heterologous isolates by purified serum IgG

^aThe values are the average with standard deviation of results from two independent experiments performed in duplicate. The C640 sera were tested at a 1:20 serum dilution and not 10 mg/ml. Red, >90% neutralization; yellow, 70.0 to 89.9% neutralization; green, 50.0 to 69.9% neutralization; blue, <50% neutralization but above background; gray, background; purple, enhancement of infection.

^bSera from the SHIV_SF162P4-infected animal at 643 days postinfection.