Inhibition of cytoadhesion of FCR3 rIE^CSA to endothelial cells using anti–RSP-2 mAbs. 40μL suspension of 10⁷ rIE^CSA/mL was incubated for 2 hours at 37°C on a confluent monolayer of Sc1D cells grown on 12 dot IFA slides in the presence of different concentrations of mAbs. Slides were washed and adherent rIEs counted. Results are expressed as mean ± SD percent inhibition of control. (A) Inhibition of rIE^CSA cytoadhesion in the presence of different concentrations of mAbs B4, C10, and D10. (B) Inhibition of rIE^CSA cytoadhesion of laboratory strains from different geographical areas, FCBR, BXII, SUK, HB, and IBR to Sc1D. (C) Placental isolates from Cameroonian women by anti–RSP-2 mAb B4. (D) Inhibition of rIE^CSA cytoadhesion to Sc1D by different concentrations of mAb B4 mixed together with 2 × 10⁷ rIE^CSA under flow conditions at 0.05 Pa.