The circumoval precipitin reaction on Schistosoma mansoni eggs as seen by scanning electron microscopy.

The circumoval precipitin reaction on Schistosoma mansoni eggs was examined for the first time by scanning electron microscopy. The precipitates appeared as layered segmenters, and apparent fusion of adjacent precipitates was observed. This suggests that the single precipitates seen by light microscopy may on occasion be a collection of several precipitates exuding from nearby pores. The precipitates appeared on all areas of the egg surface except the spine.