Prevalence and intensity of infections in the lymnaeid snail Omphiscola glabra experimentally infected with Fasciola hepatica, Fascioloides magna and Paramphistomum daubneyi

2007 ◽  
Vol 81 (1) ◽  
pp. 7-12 ◽  
Author(s):  
G. Dreyfuss ◽  
A. Novobilský ◽  
P. Vignoles ◽  
V. Bellet ◽  
B. Koudela ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Larval Development ◽  
Fasciola Hepatica ◽  
Fascioloides Magna ◽  
Post Exposure ◽  
Cercarial Production ◽  
Lymnaeid Snail

AbstractSingle and double infections of juvenile Omphiscola glabra (Gastropoda: Lymnaeidae) with Paramphistomum daubneyi and/or Fasciola hepatica were carried out to determine the redial burden and cercarial production in snails dissected at day 60 or at day 75 post-exposure (p.e.) in the laboratory at 20°C. The results were compared with those obtained with single-miracidium infections by Fascioloides magna. Compared to F. hepatica, low values were noted at day 75 p.e. for the prevalence of snail infections with P. daubneyi (4.6–8.3% instead of 23.6–25.9%), the total number of free rediae (10.7–17.9 per snail instead of 26.3–34.7), and that of free cercariae (112.8–136.9 per snail instead of 177.8–248.5). Despite a greater number of free rediae at day 75 p.e. (36.2–45.6 per snail), the prevalences of snail infections with F. magna and cercarial production were similar to those noted for F. hepatica. The results concerning F. hepatica and P. daubneyi might partly be explained by a progressive adaptation of O. glabra to sustain the larval development of these digeneans over the years, as this snail is a natural intermediate host of F. hepatica and P. daubneyi in central France since 1995. Compared with the high number of fully-grown rediae of F. magna in O. glabra, cercarial production seemed limited and this might be explained by the presence of high numbers of rediae which reduced the avaibility of nutrients for cercarial differentiation within the snail.

Role of the lymnaeid snailPseudosuccinea columellain the transmission of the liver flukeFasciola hepaticain Egypt

2014 ◽  
Vol 89 (6) ◽  
pp. 699-706 ◽  
Author(s):  
Y. Dar ◽  
P. Vignoles ◽  
D. Rondelaud ◽  
G. Dreyfuss
Keyword(s):  
Microsatellite Markers ◽  
Intermediate Host ◽  
Larval Development ◽  
Experimental Infection ◽  
Fasciola Hepatica ◽  
Experimental Infections ◽  
Lymnaeid Snail ◽  
Important Intermediate

AbstractExperimental infections of three EgyptianPseudosuccinea columellapopulations with sympatric miracidia ofFasciolasp., coming from cattle- or sheep-collected eggs, were carried out to determine the capacity of this lymnaeid to support larval development of the parasite. Using microsatellite markers, the isolates of Egyptian miracidia were identified asFasciola hepatica. Apart from being independent of snail origin, prevalences ranging from 60.4 to 75.5% in snails infected with five miracidia ofF. hepaticawere significantly higher than values of 30.4 to 42.2% in snails with bi-miracidial infections. The number of metacercariae ranged from 243 to 472 per cercarial-shedding snail and was independent of snail origin, parasite origin and miracidial dose used for infection. IfP. columellawas subjected to two successive bi-miracidial infections withF. hepatica, prevalence of infection was 63.3%, with a mean of 311 metacercariae per snail. These values were clearly greater than those already reported forRadix natalensisinfected with the same parasite and the same protocol. Successful experimental infection ofP. columellawithF. hepaticasuggests that this lymnaeid snail is an important intermediate host for the transmission of fascioliasis in Egypt.

scholarly journals Differences in the compatibility of infection between the liver flukes Fascioloides magna and Fasciola hepatica in a Colombian population of the snail Galba sp.

2014 ◽  
Vol 89 (6) ◽  
pp. 720-726 ◽  
Author(s):  
G. Dreyfuss ◽  
A.C. Correa ◽  
F.F. Djuikwo-Teukeng ◽  
A. Novobilský ◽  
J. Höglund ◽  
...  
Keyword(s):  
Czech Republic ◽  
Larval Development ◽  
Fasciola Hepatica ◽  
Intermediate Hosts ◽  
The Czech Republic ◽  
Galba Truncatula ◽  
Fascioloides Magna ◽  
Post Exposure ◽  
Experimental Infections ◽  
Liver Flukes

AbstractExperimental infections of Galba sp. (origin, Colombia) with allopatric isolates of Fasciola hepatica from France or Fascioloides magna from the Czech Republic were carried out during five successive snail generations to determine if this lymnaeid might sustain complete larval development of either parasite. In snails exposed to F. hepatica, 7 of 400 snails harboured several rediae and only two snails contained a small number of free cercariae on day 50 post-exposure. In contrast, the intensity of F. magna infection in Galba sp. progressively increased from the F1 to F5 generations. Spontaneous cercarial shedding of F. magna occurred in 7 of 100 Galba sp. belonging to the F5 generation and the number of shed cercariae did not differ significantly from that noted in control Galba truncatula of French origin. Galba sp. from Colombia can be added to the list of potential intermediate hosts for F. magna.

Lymnaea neotropica and Lymnaea viatrix, potential intermediate hosts for Fascioloides magna

2012 ◽  
Vol 87 (4) ◽  
pp. 494-500 ◽  
Author(s):  
R. Sanabria ◽  
R. Mouzet ◽  
J. Pankrác ◽  
F.F. Djuikwo Teukeng ◽  
B. Courtioux ◽  
...  
Keyword(s):  
Larval Development ◽  
Reference Group ◽  
South American ◽  
French Population ◽  
Intermediate Hosts ◽  
South American Species ◽  
Galba Truncatula ◽  
Fascioloides Magna ◽  
Post Exposure ◽  
Cercarial Production

AbstractExperimental infections of two South American lymnaeid populations with Fascioloides magna were carried out to determine whether these snails may sustain larval development of this digenean and, if so, to quantify their potential for cercarial production. The reference group was a French population of Galba truncatula infected and raised according to the same protocol. According to the internal transcribed sequence (ITS)-1 segment of their genomic rDNA, these South American populations were identified as Lymnaea neotropica (origin, Argentina) and Lymnaea viatrix var. ventricosa (origin, Uruguay). In the snail groups followed for cercarial shedding, longer prepatent periods and lower numbers of shed cercariae were noted in South American lymnaeids. In other snails dissected at day 65 post-exposure, the redial and cercarial burdens of F. magna found in the bodies of L. neotropica and L. v. ventricosa were significantly lower than those noted in G. truncatula. Compared to the total cercarial production noted in the dissected snails, the percentage of cercariae that exited from snails was 51.3% for G. truncatula, 32.2% for L. neotropica and 46.8% for L. v. ventricosa. The two South American species of snails can thus be considered as potential intermediate hosts of F. magna.

Fasciola hepatica larval development within the intermediate host.

2021 ◽  
pp. 23-64
Author(s):  
Gilles Dreyfuss ◽  
Philippe Sindou ◽  
Philippe Hourdin ◽  
Philippe Vignoles ◽  
Daniel Rondelaud
Keyword(s):  
Intermediate Host ◽  
Larval Development ◽  
Fasciola Hepatica ◽  
Parasitic Infections ◽  
Snail Species ◽  
Larval Behavior ◽  
Host Snail

Abstract This book chapter focuses on host snail species and larval behavior forms in snails, and features of parasitic infections in naturally or experimentally infected snails, or in coinfected snails.

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.

Larval development of Fasciola hepatica in experimental infections: variations with populations of Lymnaea truncatula

2002 ◽  
Vol 76 (2) ◽  
pp. 179-183 ◽  
Author(s):  
P. Vignoles ◽  
G. Dreyfuss ◽  
D. Rondelaud
Keyword(s):  
Retrospective Study ◽  
Genetic Variability ◽  
Larval Development ◽  
Experimental Infection ◽  
Fasciola Hepatica ◽  
The Other ◽  
Mammalian Host ◽  
Cercarial Production ◽  
Lymnaea Truncatula ◽  
Low Prevalence

AbstractA retrospective study was undertaken on 70 French populations of Lymnaea truncatula experimentally infected with Fasciola hepatica to determine whether or not susceptibility of snails to infection influenced redial and cercarial production. Results were compared with those obtained from two control populations, known for prevalences higher than 60% when experimentally infected with F. hepatica. In the 70 other populations examined, the prevalences ranged from 2 to 75%. In 55 of these populations, where the prevalence was more than 20%, a high proportion (50.1–56.8%) of snails died after cercarial shedding, whereas in the other groups (non-shedding snails with the most differentiated larvae being free cercariae, rediae containing cercariae, immature rediae, or sporocysts, respectively), snail death was significantly less. In 11 populations, where the prevalence values were 5–19%, only 14% of snails died after cercarial shedding, whereas snails with free cercariae, rediae with cercariae, or immature rediae showed significant increases in snail mortality. In the remaining four snail populations, with prevalences of less than 5%, the most differentiated larval forms were only immature rediae and/or sporocysts. Overall, the number of rediae containing cercariae significantly decreased with decreasing prevalence values. The low prevalence of experimental infection in several populations of snails might be explained by the occurrence of natural infections with miracidia originating from a mammalian host other than cattle, and/or by genetic variability in the susceptibility of snails to infection.

The Identity of the Australian Lymnaeid Snail Host of Fasciola hepatica L. and its Response to Environment

1961 ◽  
Vol 12 (2) ◽  
pp. 150 ◽  
Author(s):  
JC Boray ◽  
DF McMichael
Keyword(s):  
New Zealand ◽  
Intermediate Host ◽  
Type Species ◽  
Fasciola Hepatica ◽  
Snail Host ◽  
Type Material ◽  
Field Observations ◽  
Lymnaeid Snail ◽  
Laboratory Breeding

The taxonomic literature on the Australian Lymnaeidae is reviewed, with reference to the names used for Australian snail groups. The three generic names based on Australian type species are all considered to be synonyms of Lymnaea Lamarck. The specific names are discussed and new synonymies are given as a result of a comparison of type material, laboratory breeding experiments, and field observations. It is concluded that there is only one species which acts as the intermediate host for Fasciola hepatica L., in both Australia and New Zealand, and that its correct name is Lymnaea tomentosa (Pfeiffer, 1855).

The presence of predators modifies the larval development of Fasciola hepatica in surviving Lymnaea truncatula

2002 ◽  
Vol 76 (2) ◽  
pp. 175-178 ◽  
Author(s):  
D. Rondelaud ◽  
P. Vignoles ◽  
G. Dreyfuss
Keyword(s):  
Survival Rate ◽  
Larval Development ◽  
Significant Variation ◽  
Fasciola Hepatica ◽  
Stress Reaction ◽  
Experimental Exposure ◽  
Post Exposure ◽  
Progressive Development ◽  
Experimental Infections ◽  
Lymnaea Truncatula

AbstractExperimental infections of Lymnaea truncatula with Fasciola hepatica were performed to study the consequences of the presence of predators (sciomyzid larvae or zonitid snails) on the characteristics of larval F. hepatica development in surviving snails. Controls consisted of infected snails that were not subjected to predators. Compared to controls, the survival rate at day 30 post-exposure, the duration of cercarial shedding, and the number of cercariae shed by surviving snails were significantly lower when predators were present in snail breeding boxes, whatever the type of predator used. In contrast, the prevalences of Fasciola infections in snails, and the length of time between exposure and the onset of cercarial shedding showed no significant variation. The progressive development of a stress reaction in surviving snails against predators during the first 30 days of experimental exposure to F. hepatica would influence snail survival during the cercarial shedding period and, consequently, the number of cercariae shed by the snails.

Fasciola hepatica: an unusual development of redial generations in an isolate of Lymnaea truncatula

1999 ◽  
Vol 73 (1) ◽  
pp. 27-30 ◽  
Author(s):  
D. Augot ◽  
M. Abrous ◽  
D. Rondelaud ◽  
G. Dreyfuss ◽  
J. Cabaret
Keyword(s):  
Larval Development ◽  
Fasciola Hepatica ◽  
The Body ◽  
Pharyngeal Wall ◽  
Post Exposure ◽  
Pharyngeal Region ◽  
Lymnaea Truncatula

Single-miracidium infections of Lymnaea truncatula by Fasciola hepatica were experimentally carried out to identify the redial generations of this trematode when the larval development was unusual (when the first-appearing mother redia, or R1a redia, died after its exit from the sporocyst). Four parameters were measured in the body and pharyngeal region at weekly intervals. At day 49 post-exposure at 20°C, the body of the second mother rediae (R1b) was significantly longer than that of the subsequent generations, R2a and R2b/R3a (a mean of 3.0 mm instead of 1.0 and 0.9 mm, respectively). The body was significantly wider in the R1b and R2a groups than in the R2b/R3a rediae. The pharyngeal lumen was significantly wider in the R1b group than in the R2a and R2b/R3a rediae (a mean of 48.6 μm instead of 10.8 and 3.3 μm at day 49). The thickness of the pharyngeal wall did not differ in the R1b and R2b/R3a groups, but was significantly lower in the R2a group (19.5 μm instead of 23.0–23.6 at day 49). There was better development of R1b and R2b/R3a rediae in the snails when the R1a redia died, compared with normal larval development (with a living R1a redia).

Studies of the relationships between Schistosoma nasale and S. spindale and their snail host Indoplanorbis exustus

1991 ◽  
Vol 65 (1) ◽  
pp. 1-7 ◽  
Author(s):  
J. de Bont ◽  
J. Vercruysse ◽  
D. van Aken ◽  
V. R. Southgate ◽  
D. Rollinson
Keyword(s):  
Sri Lanka ◽  
Intermediate Host ◽  
Snail Host ◽  
Infection Rates ◽  
Death Rates ◽  
Cercarial Production ◽  
Indoplanorbis Exustus ◽  
Level 1 ◽  
Host Parasite ◽  
Opposite Tendency

ABSTRACTInfectivity and cercarial production of Indoplanorbis exustus related to variation of miracidial dose (1, 4, 10 or 20) with Schistosoma nasale and S. spindale from Sri Lanka were studied. The intermediate host-parasite relationships of the two schistosome species showed marked differences under the conditions of observation recorded in this study. Prepatent death rates (PDR) were on average higher for S. spindale (30%) than for S. nasale (10%). The size of the miracidial dose to which snails had been exposed had no effect on PDR. The infection rates (IR) were on average higher for S. nasale (41%) compared with S. spindale (27%). Highest IR occurred after exposure to 4 miracidia in S. nasale infections (79%) and after exposure to 10 miracidia in S. spindale infections (6O%). The highest daily average cercarial production per snail was recorded for S. nasale at a level of 4 miracidia (1311), and for S. spindale at a level of 10 miracidia (1615). At low level (1 or 4 miracidia) of exposure, I. exustus showed a better compatibility with S. nasale than with S. spindale. An opposite tendency was observed at higher levels (10 or 20 miracidia) of exposure. Unsuccessful infections of Lymnaea luteola with either S. nasale or S. spindale indicate that this species is not involved in transmission.

Sign in / Sign up

Export Citation Format

Share Document