Abstract: As the effective components of schistosome egg antigen were heat-stable, the "antigen slide" on which the heated and ultrasonicated ova suspended in distilled water were dried by heating was used for COPT. Sera from 104 patients passing schistosome eggs gave a COPT positivity rate of 96.2%. The "antigen slide" COPT is recommended because its manipulation was faster and simpler than that of routine COPT, and positive slides could be kept for a comparatively longer period of time.