Capture of progeny virus harvested from RAJI-CD4 and RM3-CD4 cells acutely infected with HIV-1_IIIB . Purified virus stocks (1,000 TCID₅₀ ) from acutely infected RAJI-CD4 (▪) and RM3-CD4 (□) cells were added to wells precoated with different MoAbs or an HIV-1 neutralizing sera. The presence of captured viral particles was next investigated with the use of a commercial p24 enzymatic assay. Results shown represent the average ± SD of triplicate samples.