A Simplified Method for the Concentration of Cercariae

Abstract

The cercarial suspension obtained by exposing Austra-lorbis glabratus infected with Schistosoma mansoni to indirect sunlight is transferred to crucibles fitted with permanent porous plates (sintered glass crucibles). The crucible is placed in a crystallizing dish so that the water will flow spontaneously and the cercarial suspension is then concentrated. A Buchner funnel with fused-in fritted disc of medium porosity adapted to a suction flask is recommended for obtaining large amounts of heavy cercarial suspensions.