scholarly journals Comparative Differences in Radula Characteristics of Schistosoma Snail Intermediate Host in the Forskalii Group

2022 ◽  
Vol 18 (1) ◽  
pp. 1-7
Author(s):  
Opeyemi G. Oso ◽  
Alexander B. Odaibo
Keyword(s):  
Intermediate Host ◽  
Snail Intermediate Host

Snail intermediate host/Schistosoma haematobium relationships from three transmission sites in Benin (West Africa)

2012 ◽  
Vol 112 (1) ◽  
pp. 227-233 ◽  
Author(s):  
Moudachirou Ibikounlé ◽  
Gabriel Mouahid ◽  
Rodrigue Mintsa Nguema ◽  
Nestor Sakiti ◽  
Achille Massougbodji ◽  
...  
Keyword(s):  
West Africa ◽  
Intermediate Host ◽  
Schistosoma Haematobium ◽  
Snail Intermediate Host

scholarly journals Distribution Patterns of the Snail Intermediate Host of Schistosoma japonicum — China, 2015−2019

2021 ◽  
Vol 3 (5) ◽  
pp. 81-84
Author(s):  
Lijuan Zhang ◽  
◽  
Shan Lv ◽  
Chunli Cao ◽  
Jing Xu ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Schistosoma Japonicum ◽  
Distribution Patterns ◽  
Snail Intermediate Host

scholarly journals Distribution and habitats of Lymnaea natalensis, snail intermediate host of the liver fluke Fasciola gigantica, in South Africa

2001 ◽  
Vol 20 (2) ◽  
pp. 56-71
Author(s):  
Editorial Office
Keyword(s):  
South Africa ◽  
Intermediate Host ◽  
Geographical Distribution ◽  
Liver Fluke ◽  
Economic Factor ◽  
Freshwater Snail ◽  
Fasciola Gigantica ◽  
Snail Intermediate Host ◽  
Planning And Construction ◽  
Lymnaea Natalensis

This paper focuses on the geographical distribution and the habitats of Lymnaea natalensis, the snail intermediate host of the liver fluke, Fasciola gigantica, as reflected by the collection sites of its 4 552 samples currently on record in the National Freshwater Snail Collection (NFSC) of South Africa. Although this species was represented in a variety of waterbodies, the majority of samples(±70%)came from rivers, brooks and dams and in 70.8% of the cases the water was described as permanent and in 71.8% as slow flowing or standing. The results of life-table studies conducted by various authors indicated that temperature should be a relatively unimportant factor in determining its geographical distribution, but that the availability of permanent water should be decisive for its presence in a given habitat. These results are in agreement with the finding that only 7.5% of the samples of this species in the NFSC were collected in habitats which were described as seasonal. Furthermore, it gives a logical explanation for the sporadic occurrence, or total absence of this species in the more arid regions of South Africa. Water impoundments and irrigation networks contribute to a large extent towards creating perennial habitats which would be suitable for L. natalensis. As intermediate host for one of the liver fluke species which already is an economic factor in South Africa, this certainly is an aspect which ought to be reckoned within the planning and construction of new irrigation schemes.

scholarly journals Resource fluctuations inhibit the reproduction and virulence of the human parasite Schistosoma mansoni in its snail intermediate host

2020 ◽  
Vol 287 (1919) ◽  
pp. 20192446
Author(s):  
David J. Civitello ◽  
Lucy H. Baker ◽  
Selvaganesh Maduraiveeran ◽  
Rachel B. Hartman
Keyword(s):  
Schistosoma Mansoni ◽  
Intermediate Host ◽  
Population Level ◽  
Host Population ◽  
Environmental Drivers ◽  
Bioenergetic Model ◽  
Snail Intermediate Host ◽  
Human Parasite ◽  
Infection Dynamics ◽  
Periodic Starvation

Resource availability can powerfully influence host–parasite interactions. However, we currently lack a mechanistic framework to predict how resource fluctuations alter individual infection dynamics. We address this gap with experiments manipulating resource supply and starvation for a human parasite, Schistosoma mansoni , and its snail intermediate host to test a hypothesis derived from mechanistic energy budget theory: resource fluctuations should reduce schistosome reproduction and virulence by inhibiting parasite ingestion of host biomass. Low resource supply caused hosts to remain small, reproduce less and produce fewer human-infectious cercariae. Periodic starvation also inhibited cercarial production and prevented infection-induced castration. The periodic starvation experiment also revealed substantial differences in fit between two bioenergetic model variants, which differ in their representation of host starvation. Simulations using the best-fit parameters of the winning model suggest that schistosome performance substantially declines with resource fluctuations with periods greater than 7 days. These experiments strengthen mechanistic theory, which can be readily scaled up to the population level to understand key feedbacks between resources, host population dynamics, parasitism and control interventions. Integrating resources with other environmental drivers of disease in an explicit bioenergetic framework could ultimately yield mechanistic predictions for many disease systems.

The effect of density of first-stage larvae of Elaphostrongylus rangiferi on the infection rate in the snail intermediate host

Parasitology ◽  
1988 ◽  
Vol 96 (3) ◽  
pp. 487-492 ◽  
Author(s):  
Arne Skorping
Keyword(s):  
Experimental Data ◽  
Intermediate Host ◽  
Infection Rate ◽  
Instantaneous Rate ◽  
Snail Intermediate Host ◽  
Arianta Arbustorum ◽  
Elaphostrongylus Rangiferi ◽  
The Relationship ◽  
Direct Proportionality

SUMMARYThe relationship between the density of lst-stage larvae of Elaphostrongylus rangiferi on the infection rate into the gastropod intermediate host, Arianta arbustorum, was studied experimentally. Within a range of densities between 30 and 1100 larvae/cm2 the experimental data gave a good fit to the conventional epidemiological assumption of direct proportionality between the net infection rate and the density of infective stages. The instantaneous rate of infection was estimated to be about 1 × 10−3/larvae/snail/2 h. At higher densities (> 1100 larvae/cm2) the instantaneous rate of infection showed a densitydependent decline.

Sign in / Sign up

Export Citation Format

Share Document