Snail Host Finding by Fasciola hepatica and Trichobilharzia ocellata: Compound Analysis of “Miracidia-Attracting Glycoproteins”

2000 ◽  
Vol 96 (4) ◽  
pp. 231-242 ◽  
Author(s):  
Martin Kalbe ◽  
Bernhard Haberl ◽  
Wilfried Haas
Keyword(s):  
Fasciola Hepatica ◽  
Host Finding ◽  
Snail Host ◽  
Trichobilharzia Ocellata

Pseudosuccinea columella (Say 1817) (Gastropoda, Lymnaeidae), snail host of Fasciola hepatica: first record for France in the wild

2007 ◽  
Vol 101 (5) ◽  
pp. 1389-1392 ◽  
Author(s):  
Jean-Pierre Pointier ◽  
Christine Coustau ◽  
Daniel Rondelaud ◽  
André Theron
Keyword(s):  
Fasciola Hepatica ◽  
First Record ◽  
Snail Host ◽  
In The Wild

Development ofFasciola hepaticainLymnaea columellainfected with miracidia derived from cattle and marmoset infections

2008 ◽  
Vol 82 (1) ◽  
pp. 81-84 ◽  
Author(s):  
E.A. Mendes ◽  
W.S. Lima ◽  
A.L. de Melo
Keyword(s):  
Survival Rate ◽  
Intermediate Host ◽  
Post Infection ◽  
Fasciola Hepatica ◽  
Bos Taurus ◽  
Snail Host ◽  
Vertebrate Host ◽  
Infection Rates ◽  
Host Origin ◽  
Cattle Faeces

AbstractThe development ofFasciola hepaticafrom two species of definitive hosts, i.e. cattle (Bos taurus) and a marmoset (Callithrix penicillata) in the snailLymnaea columellawas determined based on the production of rediae and cercariae and snail survival rate. More rediae and cercariae at 60–74 days post-infection were produced by snails infected by cattle-derived miracidia (cattle group) than by those infected by marmoset-derived miracidia (marmoset group). Among theL. columellaparasitized by the marmoset group, the survival rate and the percentage of positive snails were higher than among those parasitized by the cattle group. Eggs ofF. hepaticareleased in cattle faeces were significantly bigger than those released in marmoset faeces. Miracidia originating from parasites that completed their development in cattle were more efficient in infecting the intermediate host. These results suggest that vertebrate-host origin influences the eggs produced by the parasite and the infection rates in the snail hostL. columella.

A multiplex PCR for the detection of Fasciola hepatica in the intermediate snail host Galba cubensis

2015 ◽  
Vol 211 (3-4) ◽  
pp. 195-200 ◽  
Author(s):  
Annia Alba ◽  
Antonio A. Vázquez ◽  
Hilda Hernández ◽  
Jorge Sánchez ◽  
Ricardo Marcet ◽  
...  
Keyword(s):  
Multiplex Pcr ◽  
Fasciola Hepatica ◽  
Snail Host ◽  
Intermediate Snail Host

The stimulation of daughter redia production during the larval development of Fasciola hepatica

Parasitology ◽  
1976 ◽  
Vol 72 (3) ◽  
pp. 245-257 ◽  
Author(s):  
R. A. Wilson ◽  
Tove Draskau
Keyword(s):  
High Temperature ◽  
Larval Development ◽  
Fasciola Hepatica ◽  
Snail Host ◽  
Parasite Development ◽  
Cercarial Production ◽  
Stimulation Of

SummaryIn snails maintained at 20 °C rediae of Fasciola hepatica emerge from sporocysts from 11 days after infection onwards. The number of mother rediae rises steadily thereafter until at least 40 days after infection. Daughter rediae are seldom observed in mother rediae dissected from snails maintained at 20 °C. Their production can, however, be stimulated by subjecting the snail host to starvation, to low, and to high temperature shocks. The parasite is susceptible to stress from immediately after infection for about 16 days, when maintained at 20 °C. In general, the more extreme the shock, the greater is daughter redial production. Increasing the length of the period of stress from 12 h up to 9 days does not increase the production of daughter rediae, nor does repeated on/off cold shocks or continuous maintenance at 10 °C. Daughter rediae develop more rapidly than cercariae and leave the mother rediae several days earlier. There is no evidence that presence of daughter rediae coincides with the suppression of cercarial production. The findings are discussed with reference to possible mechanisms by which parasite development might be controlled.

Host-finding in Trichobilharzia ocellata cercariae: swimming and attachment to the host

Parasitology ◽  
1988 ◽  
Vol 96 (3) ◽  
pp. 493-505 ◽  
Author(s):  
W. Feiler ◽  
W. Haas
Keyword(s):  
Energy Saving ◽  
Temperature Difference ◽  
Water Surface ◽  
Host Finding ◽  
Swimming Behaviour ◽  
Chemical Components ◽  
Maximal Response ◽  
Free Swimming ◽  
Trichobilharzia Ocellata ◽  
Selection Of

SUMMARYThe cercaria of Trichobilharzia ocellata finds and identifies its duck host with a seriesof different behavioural phases. Dispersal and selection of the water surface as microhabitat is achieved by an intermittent swimming behaviour, which is governed by the interplay of passive dropping with forward and backward swimming movements and includes a positive phototactic and a geonegative orientation. Then the cercariae tend to cling to the water surface in an energy-saving resting position. A movement towards the duck feet as the site of entry occurs when shadows evoke forward swimming movements, which are directed away from the source of light, i.e. normally downwards. Forward swimming movements are also stimulated by touch, but only in free-swimming cercariae and not when these are in the resting position. Attachments occur only when a substrate is touched during forward swimming movements. Attachments are stimulated by warm substrates (1 °C temperature difference triggers a nearly maximal response) and by chemical components of duck-foot skin, and the readiness to attach is increased when the forward swimming movement is started by shadow stimuli.

Composition, secretion, and fate of the glands in the miracidium and sporocyst of Fasciola hepatica L.

1983 ◽  
Vol 57 (2) ◽  
pp. 79-84 ◽  
Author(s):  
Gerald R. Buzzell
Keyword(s):  
Fasciola Hepatica ◽  
Leading Edge ◽  
Snail Host ◽  
Epidermal Cells ◽  
Positive Material ◽  
Apical Papilla

ABSTRACTThe anterior end of the miracidium of Fasciola hepatica contains a large flask-shaped apical gland and four unicellular lateral glands, all of which have ducts which pass to the tip of the apical papilla. These glands appear to be involved in penetration of the larva into the snail host. The apical gland secretes as the miracidium proves the epidermis of the host before attachment. It seems likely that its secretion is a chemical which lyses the epidermal cells. The lateral glands are PAS-positive and may contain a neutral mucopolysaccharide. They also secrete as the miracidium probes the snail and a layer of PAS-positive material may be seen at the leading edge of the apical papilla as the larva penetrates into the host. Both the apical gland and the lateral glands may be visible in the sporocyst for several days after penetration.

Host-finding in Echinostoma caproni: miracidia and cercariae use different signals to identify the same snail species

Parasitology ◽  
2000 ◽  
Vol 120 (5) ◽  
pp. 479-486 ◽  
Author(s):  
B. HABERL ◽  
M. KÖRNER ◽  
Y. SPENGLER ◽  
J. HERTEL ◽  
M. KALBE ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Total Concentration ◽  
Host Finding ◽  
Snail Host ◽  
Size Exclusion ◽  
Snail Species ◽  
Echinostoma Caproni ◽  
Exclusion Chromatography ◽  
First Time

The snail host signals releasing host-finding responses in miracidia and cercariae of Echinostoma caproni were analysed by fractionation of snail-conditioned water (SCW). Cercariae responded non-specifically to organic and hydrophilic, low molecular weight components of SCW showing their typical turning response. Hydrolysis of peptides in SCW had no effect on cercarial responses. An artificial mixture of amino acids in concentrations determined from SCW as well as glycine alone in a concentration corresponding to the total concentration of amino acids in SCW showed nearly the same efficacy as SCW itself. Miracidia responded to a high molecular weight glycoprotein fraction, which could be isolated from SCW by ion-exchange and size-exclusion chromatography. In contrast to an Egyptian Schistosoma mansoni strain, the echinostome miracidia were not able to differentiate between different snail species. The results show for the first time that miracidia and cercariae of the same species may use different signals to identify the same snail host species. This indicates an independent evolution of host-finding mechanisms in the two parasite stages.

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