THE EFFECT OF TEMPERATURE ON THE DEVELOPMENT OF FASCIOLA HEPATICA IN THE INTERMEDIATE HOST LYMNAEA TRUNCATULA AND ITS INFLUENCE ON THE EPIDEMIOLOGY OF FASCIOLIASIS

1999 ◽  
pp. 1059-1060
Author(s):  
C.B. OLLERENSHAW
Keyword(s):  
Intermediate Host ◽  
Fasciola Hepatica ◽  
Effect Of Temperature ◽  
Lymnaea Truncatula

scholarly journals STUDY OF MOLLUSCS’ INFESTATION WITH FASCIOLA HEPATICA IN BRYANSK REGION

2019 ◽  
pp. 481-486
Author(s):  
Postevoy ◽  
Andreyanov ◽  
Puzanova
Keyword(s):  
Intermediate Host ◽  
Infection Rate ◽  
Fasciola Hepatica ◽  
Pond Snail ◽  
Stages Of Development ◽  
Larval Stages ◽  
Development Cycle ◽  
Lymnaea Truncatula

The intermediate host of Fasciola hepatica is Lymnaea truncatula mollusk. However, participation of other species of mollusks (L. stagnalis, Galba palustris, etc.) in the development cycle of F. hepatica is not excluded. In this connection, we have studied the distribution of mollusks of these species in the territory of the Bryansk region. The aim of the work was to carry out a study on the invasion of fasciol larvae of mollusks on pastures of trematodiasis-unfriendly farms of the Bryansk region. On farms, the density of mollusks and their species, as well as the dynamics of the infection of mollusks by the partenite stages of F. hepatica, were determined. The work was carried out from May to October 2018 on 3 pastures with an area of 2 to 5 hectares. The study was subjected to mollusks: small pond snail L. truncatula in the amount of from 149 to 151 specimens, ordinary pond snail – L. stagnalis from 10 to 18 specimens, marsh pond snail – L. palustris from 30 to 85 specimens, iushkoviy pond snail – L. auricularia from 4 to 21 specimens. Mollusks were examined every month during the pasture period (May-October) for infection with fasciol larvae by the compressor method. It was revealed that only small pond snail L. truncatula was infested by the larval stages of development of fasciol. The rest of the limneids were free from this trematodase invasion. The small pond snail was infected more intensely in September. The fasciol larvae of the small pond snail were recorded in May, June, August and September; the infection rate was 1.3%, 2.6%, 6.6% and 8%, respectively.

The distribution ofFasciola hepaticaandFasciola giganticawithin southern Tanzania – constraints associated with the intermediate host

Parasitology ◽  
2008 ◽  
Vol 135 (4) ◽  
pp. 495-503 ◽  
Author(s):  
S. M. WALKER ◽  
A. E. MAKUNDI ◽  
F. V. NAMUBA ◽  
A. A. KASSUKU ◽  
J. KEYYU ◽  
...  
Keyword(s):  
High Altitude ◽  
Intermediate Host ◽  
East Africa ◽  
Fasciola Hepatica ◽  
Molecular Data ◽  
Climatic Conditions ◽  
Fasciola Gigantica ◽  
Rrna Gene ◽  
28S Rrna ◽  
Lymnaea Truncatula

SUMMARYIn East Africa,Fasciola giganticais generally the causative agent of fasciolosis but there have been reports ofF. hepaticain cattle from highland regions of Kenya, Ethiopia, Uganda and Zaire. The topography of the Southern Highlands of Tanzania provides an environment where the climatic conditions exist for the sustenance of lymnaeid species capable of supporting bothFasciola hepaticaandF. gigantica. Theoretically this would allow interaction between fasciolid species and the possible creation of hybrids. In this report we present molecular data confirming the existence of the snail,Lymnaea truncatula, at high altitude on the Kitulo Plateau of the Southern Highlands, Tanzania, along with morphometric and molecular data confirming the presence ofF. hepaticain the corresponding area. At lower altitudes, where climatic conditions were unfavourable for the existence ofL. truncatula, the presence of its sister speciesL. natalensiswas confirmed by molecular data along with its preferred fasciolid parasite,F. gigantica. Analysis based on a 618 bp sequence of the 28S rRNA gene did not reveal the presence of hybrid fasciolids in our fluke samples.

OBSERVATIONS ON THE BIONOMICS OF OVA AND MIRACIDIA OF FASCIOLA HEPATICA LINN., IN EASTERN CANADA

1939 ◽  
Vol 17d (10) ◽  
pp. 205-211 ◽  
Author(s):  
Henry J. Griffiths
Keyword(s):  
Intermediate Host ◽  
Fasciola Hepatica ◽  
Effect Of Temperature ◽  
Eastern Canada ◽  
Light Darkness

The effect of temperature, light, darkness, and chemicals on the hatching of the eggs of Fasciola hepatica is discussed. Some malformations of the eggs of this parasite together with observations on the miracidia are recorded. A description of methods employed for attempted infestation of suspected snails is given. In no instance, however, were any specimens of the 11 species of snails exposed, proven to act as intermediate host for F. hepatica.

Microsatellites in the hermaphroditic snail,Lymnaea truncatula, intermediate host of the liver fluke,Fasciola hepatica

2000 ◽  
Vol 9 (10) ◽  
pp. 1662-1664 ◽  
Author(s):  
S. Trouvé ◽  
L. Degen ◽  
C. Meunier ◽  
C. Tirard ◽  
S. Hurtrez-Boussès ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Liver Fluke ◽  
Fasciola Hepatica ◽  
Lymnaea Truncatula

A study of the effect of temperature on the growth of Fasciola hepatica in Lymnaea truncatula

Parasitology ◽  
1974 ◽  
Vol 68 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Nigel G. Nice ◽  
R. A. Wilson
Keyword(s):  
Growth Rate ◽  
Fasciola Hepatica ◽  
Meteorological Data ◽  
Snail Host ◽  
Parasite Growth ◽  
Effect Of Temperature ◽  
Lymnaea Truncatula ◽  
Relationship Of ◽  
Environmental Temperatures ◽  
Simulation Equation

The growth rates of the intramolluscan stages of the parasite Fasciola hepatica were determined at three temperatures 16°, 20° and 25°C. A graphical relationship of growth rate with respect to temperature was produced and a growth array was calculated from this. Meteorological data were summarized in the form of a temperature array. These arrays were then used in conjunction with a simple equation to simulate parasite growth within the snail host. A digital computer was employed to solve iteratively the simulation equation, initially by checking its application against experimentally determined results. It was then employed with the meteorological data to simulate growth with respect to environmental temperatures and the results obtained were compared with those derived from field collections. Estimates were also made of the duration of the shortest life-cycle under field conditions.

The effects of Fasciola hepatica on Lymnaea truncatula

Parasitology ◽  
1972 ◽  
Vol 65 (2) ◽  
pp. 359-369 ◽  
Author(s):  
J. K. M. Hodasi
Keyword(s):  
Rapid Growth ◽  
Egg Production ◽  
Fasciola Hepatica ◽  
Age Groups ◽  
Sharp Decline ◽  
General Belief ◽  
Functional Changes ◽  
Complete Cessation ◽  
Lymnaea Truncatula ◽  
Accelerated Growth

Among the functional changes observed in L. truncatula infected with F. hepatica were those of growth, reproduction and mortality. For the first 3 weeks after infection there was no difference between the growth of infected and uninfected groups of snails. Thereafter there was a temporary accelerated growth which occurred between the fourth and seventh weeks after infection. The onset of this period of rapid growth in the different age groups of infected snails coincided with the time of migration of the rediae into the hepatopancreas. Of more significance was the influence of infection on the reproduction of the snail. There was a sharp decline in oviposition 2–3 weeks after infection, followed by a complete cessation of egg production at the end of the fifth week. Once oviposition ceased, it was not resumed and there was no self-cure. Contrary to general belief, infected groups of L. truncatula have been found to live longer than the uninfected controls. With isolated snails, however, there was a tendency for the uninfected snails to live longer than the infected ones. The possible interpretation of the discrepancies between isolated and mass cultured snails are discussed. The hepatopancreas and the gonad (ovotestis) were the two structures directly affected by the infection. Establishment of the rediae in the hepatopancreas invariably resulted in parasitic castration.

scholarly journals Natural infection of Lymnaea truncatula by the liver fluke Fasciola hepatica in the Porma Basin, León, NW Spain

1991 ◽  
Vol 65 (1) ◽  
pp. 15-27 ◽  
Author(s):  
Y. Manga-Gonzalez ◽  
C. Gonzalez-Lanza ◽  
C. B. Otero-Merino
Keyword(s):  
Liver Fluke ◽  
Fasciola Hepatica ◽  
Natural Infection ◽  
Infection Prevalence ◽  
Average Intensity ◽  
Nw Spain ◽  
Chi Square ◽  
Monthly Average ◽  
Lymnaea Truncatula ◽  
Chi Square Test

ABSTRACTFor two years fortnightly malacological samplings were carried out to collect Lymnaea truncatula (Mollusca; Basommatophora) at five points in the upper and middle Porma river basin, León, Spain. The highest numbers of snails were collected in September, May and November. Of the 5486 molluscs examined, 11·41% harboured F. hepatica (Trematoda; Digenea) with an average intensity of 20·14. In general, the values of both infection prevalence and intensity increased with the size of the snails. It was in October when the highest figures for each parameter mentioned above were detected (18·73% and 28·48, respectively). The chi-square test showed statistically significant differences in relation to the infection prevalence among the groups of molluscs established according to: their length; the months in which they were collected; the sampling localities; monthly average ambient temperature; precipitation during the collection. Similarly, statistically significant differences were detected in the intensity of the infection among the groups of molluscs previously established, except for that based on the values of precipitation. Generally, parasites were found in the same snail at different stages of development. It seems that most mollusc infections occur in February–March and at the end of summer–beginning of autumn periods. The highest rate of rediae with mature cercariae ready to be shed were detected between September and December. Metacercariae in the grass samples were also observed at the end of autumn. For this reason, this period could be considered as the most suitable for infection of the definitive hosts to take place.

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