Table 1 Several characteristics of Fasciola hepatica infection in four generations of Lymnaea fuscus and Radix balthica subjected to individual bimiracidial exposures, raised at 20°C and dissected at day 50 post-exposure (first experiment)
Snail population and generation | Number of surviving snails at day 30 p.e. (%) | Number of infected snails with | Overall prevalence of infection (%) | |||
|---|---|---|---|---|---|---|
Immature rediae | Cercariae-containing rediae | Free cercariae | Cercarial shedding | |||
Lymnaea fuscus | Â | Â | Â | Â | Â | |
- F1 | 16 (32.0) | - | - | - | - | - |
- F2 | 24 (48.0) | 1 | - | - | - | 4.1 |
- F3 | 27 (54.0) | 2 | 2 | 1 | - | 18.5 |
- F4 | 29 (58.0) | 2 | 4 | 3 | 1 | 34.4 |
Radix balthica | Â | Â | Â | Â | Â | |
- F1 | 26 (42.0) | 2 | 1 | - | - | 11.52 |
- F2 | 27 (54.0) | 2 | 3 | 1 | - | 22.2 |
- F3 | 33 (66.0) | 1 | 5 | 2 | 1 | 27.2 |
- F4 | 31 (62.0) | 2 | 3 | 7 | 3 | 48.3 |