Open Access
Table 2.
Main characteristics of F. hepatica infection in snails maintained to a constant temperature of 20 °C (controls), or subjected every week to a 3-h stay at a mean temperature of 12 °C (TC, temperature-challenged; CS, cercariae-shedding; SD, standard deviation).
| Parameters | Population (A) |
Population (B) |
||
|---|---|---|---|---|
| Controls | TC snails | Controls | TC snails | |
| Number of snails at day 30 p.e. | 81 | 81 | 77 | 78 |
| Number (frequency in %): | ||||
| CS snails | 23 (28.3) | 49 (60.4)* | 14 (18.1) | 37 (47.4)* |
| NCS snails | 35 (43.2) | 6 (7.4) | 24 (31.1) | 9 (11.5) |
| Prevalence of infection (%) | 71.6 | 67.9 | 49.3 | 58.9 |
| Mean growth (SD) of CS snails during experiment (mm) | 3.2 (0.8) | 3.1 (1.0) | 2.3 (0.7) | 2.3 (0.9) |
| Mean length (SD) in days: | ||||
| Prepatent period | 49.5 (7.7) | 48.3 (3.0) | 50.2 (8.3) | 48.2 (3.1) |
| Patent period | 30.7 (9.2) | 46.2 (10.3)* | 24.5 (11.5) | 38.7 (8.9)* |
| Mean number (SD) of mcc shed by CS snails | ||||
| Floating mcc | 11.5 (5.3) | 13.3 (4.8) | 7.2 (3.1) | 4.5 (1.7) |
| Fixed and complete mcc | 217.1 (69.3) | 304.0 (80.5)* | 134.6 (50.4) | 214.0 (71.0)* |
| Fixed and incomplete mcc | 3.2 (2.4) | 44.3 (27.2)* | 1.5 (0.7) | 30.6 (11.4)* |
| Total mcc production: | ||||
| Per CS snail | 231.8 | 361.6 | 143.3 | 249.1 |
| Per snail at day 30 p.e. | 58.5 | 218.7 | 26.0 | 118.1 |
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