Fasciola hepatica L.: etude de la productivit� d'un sporocyste en fonction de la taille de Lymnaea truncatula M�ller

Rondelaud, D.; Barthe, D

doi:10.1007/bf00536027

Cited by 34 publications

(27 citation statements)

References 13 publications

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“…), the production of daughter rediae was also made, at a lesser extent, by mother rediae which emerged later from the sporocyst. By contrast, in the case of F. hepatica, daughter redia production was mainly assured by the first redia of the first generation (Rondelaud and Barthe 1987). Two perhaps complementary hypotheses may be proposed to explain the larval development of F. magna.…”

Section: Discussionmentioning

confidence: 87%

Cercarial production of Fascioloides magna in the snail Galba truncatula (Gastropoda: Lymnaeidae)

et al. 2006

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Single-miracidium infections of Fascioloides magna in two populations of Galba truncatula were carried out under laboratory conditions to count free rediae and cercariae in snail cadavers just after death. Cercaria-shedding snails were in low numbers, and their shell height at day 60 p.e. was significantly greater than that of numerous infected snails that died without cercarial shedding. In snails that died between days 44 and 60 p.e. (at 20 degrees C), the numbers of second-generation rediae significantly increased with increasing shell heights of infected snails. First-generation rediae showed insignificant, quantitative variations, while scarce rediae of the third generation were only found in the highest snails. Cercariae were only produced by the second redial generation. In both groups of snails, free cercariae appeared from 6 mm of shell height, and their numbers increased in the upper classes up to 32.9 per snail. Metacercariae were only found from 9 mm of shell height and were in low numbers. The global cercarial production ranged from 163.5 to 210.0 in the highest classes of snail size from both groups and was limited, whereas the mean burdens of free rediae fluctuated from 39.5 to 43.9. The death of numerous infected snails without cercarial shedding might be explained by the presence of a very high number of second-generation rediae simultaneously growing within the body of these snails.

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Section: Discussionmentioning

confidence: 87%

Cercarial production of Fascioloides magna in the snail Galba truncatula (Gastropoda: Lymnaeidae)

et al. 2006

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“…This dierence can easily be explained in that there were fewer P. daubneyi rediae than F. hepatica rediae. According to Abrous et al (1997), a mean of 14 rediae of P. daubneyi developed in 6-or 7-mm-high L. truncatula after infection by a single miracidium, whereas the mean number was 33 for F. hepatica (Rondelaud and Barthe 1987). The mechanism causing the shedding of P. daubneyi cercariae remains open to question.…”

Section: Discussionmentioning

confidence: 95%

Paramphistomum daubneyi and Fasciola hepatica : influence of temperature changes on the shedding of cercariae from dually infected Lymnaea truncatula

Abrous¹,

Rondelaud²,

Dreyfuss³

1999

Parasitology Research

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Dual infections of Lymnaea truncatula with Paramphistomum daubneyi and Fasciola hepatica were performed to determine whether temperature changes in snails (daily water change with spring water at 6 degrees-8 degrees C, which subsequently increased to room temperature at 20 degrees C) would influence snail infection and the production of cercariae by both trematodes. At day 30 post-exposure the surviving snails were individually placed in petri dishes to constitute two groups. Snails from the first group were maintained at a temperature of 20 degrees C, and the water in the petri dishes was changed daily. The protocol was identical for the second group of snails except that the water temperature was 6 degrees-8 degrees C when changed. The interval between exposure and the first shedding of cercariae in snails immersed in cold water for a short period was longer (67-69 days instead of 48-50 days in the 20 degrees C group). In both groups, snails infected only with F. hepatica or P. daubneyi or with both trematodes were detected. In snails infected only with F. hepatica the frequency of cercaria-shedding snails and the total number of metacercariae were significantly greater in the 20 degrees C group. Inversely, in snails infected only with P. daubneyi the frequency of cercaria-shedding snails and the number of metacercariae were significantly greater in the 6 degrees-8 degrees C group. In snails harboring both trematode larval forms, no significant difference in the frequencies of cercaria-shedding snails between the two groups was noted. Metacercariae of both trematodes were obtained from these snails. In the 20 degrees C group, F. hepatica metacercariae were more numerous, whereas in the 6 degrees-8 degrees C group the number of P. daubneyi metacercariae was greater. From these results it appears that greater activity of P. daubneyi cercariae occurs in snails subjected to daily temperature changes (from 6 degrees to 20 degrees C).

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“…32 Alternatively, small body size may affect the number of rediae and sporocysts produced, as the redial burden has been shown to be related to the size of Galba truncatula snails infected with Fasciola hepatica. 33 For both O. viverrini s.l. and virgulate cercariae, significantly fewer cercariae were released by snails in the cool-dry season with a peak being reached in the hot-dry season, which could also be related to temperature, snail size, or other environmental factors.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Transmission of Opisthorchis viverrini sensu lato and a Lecithodendriid Trematode Species in Bithynia siamensis goniomphalos Snails in Northeast Thailand

Namsanor¹,

Sithithaworn²,

Kopolrat³

et al. 2015

The American Society of Tropical Medicine and Hygiene

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Abstract. Seasonal changes play roles in the transmission success of fish-borne zoonotic trematodes (FZT). This study examined the seasonal transmission patterns of Opisthorchis viverrini sensu lato (s.l.) and a virgulate cercaria (family Lecithodendriidae) in the snail intermediate host, Bithynia siamensis goniomphalos in northeast Thailand. Snail samples were collected monthly during the rainy, cool, and hot seasons during 2012-2013 to determine the prevalence and intensity of larval trematode infections. The prevalence of O. viverrini s.l. varied significantly with season, being 0.31%, 1.05%, and 0.37% in the rainy, cool, and hot seasons, respectively (P 0.05). Similarly, the prevalence of virgulate cercariae was 3.11%, 6.80%, and 1.64% in the rainy, cool, and hot seasons, respectively (P 0.05). The intensity of larval trematode infections also varied between seasons and peaked in the hot season (P 0.05) in both species. The snails infected with O. viverrini s.l. were significantly smaller (P 0.05) and those infected with virgulate cercariae were significantly larger (P 0.05) than uninfected snails. Seasonal variation and the different sizes of B. s. goniomphalos parasitized by O. viverrini s.l. and virgulate trematodes indicate complex host-parasite interactions with important implications for the epidemiology of O. viverrini s.l.

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Fasciola hepatica L.: etude de la productivit� d'un sporocyste en fonction de la taille de Lymnaea truncatula M�ller

Cited by 34 publications

References 13 publications

Cercarial production of Fascioloides magna in the snail Galba truncatula (Gastropoda: Lymnaeidae)

Cercarial production of Fascioloides magna in the snail Galba truncatula (Gastropoda: Lymnaeidae)

Paramphistomum daubneyi and Fasciola hepatica : influence of temperature changes on the shedding of cercariae from dually infected Lymnaea truncatula

Seasonal Transmission of Opisthorchis viverrini sensu lato and a Lecithodendriid Trematode Species in Bithynia siamensis goniomphalos Snails in Northeast Thailand

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