Figure 1.

The schistosome life cycle and generation of F progeny from strains NMIR and LE. A series of single miracidia from each strain are used to infect individual snails which produce cercariae. These are 'sexed' and then a female from the NMIR strain and a male from the LE strain used to infect a hamster producing adults which mate to generate F1 progeny. The F2 generation is produced from the adults by infecting single snails with single F1 miracidia derived from the eggs. Male and female F1 cercariae are then mixed and used to infect a hamster to produce the F2. Adapted from [17].