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Table 3.

Main characteristics of P. daubneyi 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. 44 45 39 40
Number (frequency in %):
 CS snails 7 (15.9) 38 (84.4)* 8 (20.5) 21 (52.5)*
 NCS snails 31 (70.4) 4 (8.8) 13 (33.3) 3 (7.5)
Prevalence of infection (%) 86.3 93.3 53.8 60.0
Mean growth (SD) of CS snails during experiment (mm) 3.3 (1.1) 3.5 (1.0) 2.1 (0.9) 2.3 (0.8)
Mean length (SD) in days:
 Prepatent period 69.5 (10.6) 68.7 (11.2) 70.3 (8.0) 68.4 (8.9)
 Patent period 27.6 (12.9) 41.5 (7.3)* 24.1 (10.3) 36.7 (6.8)*
Mean number (SD):
 Floating mcc 0.7 (0.4) 1.5 (0.9) 1.3 (0.7) 2.4 (1.0)
 Fixed and complete mcc 91.4 (47.2) 204.8 (81.0)* 74.6 (38.5) 156.4 (62.3)*
 Fixed and incomplete mcc 0 5.6 (1.7)* 1.2 (0.5) 4.8 (1.2)*
Total mcc production:
 Per CS snail 92.1 211.9 77.1 163.6
 Per snail at day 30 p.e. 14.6 178.9 15.8 85.9
*

Significant differences between temperature-challenged snails and controls.

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