Demonstration of a common antigen between Schistosoma mansoni and Fasciola hepatica.

The presence of a common antigen between Schistosoma mansoni eggs and Fasciola hepatica adult worms was demonstrated by utilizing in an anti-S. mansoni adult worm antiserum. Although not one of the three major serologic S. mansoni egg antigens, its complete cross-reactivity suggests that serologic tests done with these crude antigenic extracts will result in many false-positive cases in areas where both parasites are endemic.