Table 2.

Mean numbers (S.D.) of H. cylindreacea cercariae shed by infected snails or counted in snails after their dissection. Individual values recorded for each parameter between 2001 and 2009 were pooled and were expressed for a single year.

			Shed cercariae		Free cercariae
	Date of snail sampling	Number of infected snails	Number of snails	Number of cercariae in three days	Number of dissected snails	Number of cercariae
Sites i and ii only frequented by B. bufo	January	33	0	-	17	15.1 (9.2)
	February	39	7	87.2 (37.8)	29	27.4 (16.9)
	March	43	41	215.3 (125.0)	37	55.3 (29.0)
	April	17	15	113.5 (82.7)	17	15.6 (11.5)
Sites iii and iv frequented by frogs and newts	January	19	0	-	0	-
	February	26	0	-	4	3.1 (2.4)
	March	22	2	59.8 (32.1)	13	11.4 (8.1)
	April	38	23	234.6 (119.4)	35	25.3 (14.0)
	May	31	30	457.1 (219.0)	30	43.5 (21.4)