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Research note

Table I.

Main characteristics of P. daubneyi infection in three species of lymnaeid snails (experiment A).

Parameters G. truncatula L. neotropica L. v. ventricosa
Number of preadult snails at exposure 100 100 100
Number of surviving snails at day 30 p.e. (survival rate %) 68 (68.0) 81 (81.0) 59 (59.0)
Number of CS snails 25 34 16
Number of NCS snails 11 7 7
Prevalence of infection (%) 52.9 50.6 54.5
Growth of CS snails during the experiment (mm)* 2.7 (0.6) 2.6 (0.8) 2.7 (0.7)
Length (days)*:
– prepatent period 69.3 (3.1) 73.1 (4.6) 71.5 (2.9)
– patent period 24.8 (1.9) 27.6 (6.0) 25.0 (8.5)
Total number of metacercariae* 169.2 (76.1) 37.4 (25.2) 253.0 (151.2)
*

Mean value (S.D.); CS snails, cercariae-shedding snails; NCS, infected snails without cercarial shedding

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