in the who procedure , in which parasites were cultivated in the presence of the patient 's plasma , 72 % of the isolates failed to mature to the schizont stage , but when infected erythrocytes were washed free of the patient 's plasma and cultivated in pooled nonimmune serum only 28.8 % of the isolates failed to develop to the schizont stage .
C0032105
plasma
C0229671
serum