Molecular arguments for splitting of Schistosoma intercalatum, into two distinct species

  title={Molecular arguments for splitting of Schistosoma intercalatum, into two distinct species},
  author={J R Pag{\`e}s and Patrick Durand and Vaughan R. Southgate and Louis-Albert Tchuem Tchuent{\'e} and Joseph Jourdane},
  journal={Parasitology Research},
Abstract The taxonomic status of the two known strains of Schistosoma intercalatum, the Lower Guinea strain (originating from Edea, Cameroon) and the Zaire strain (originating from Kinshasa, Democratic Republic of Congo, formerly Zaire) was examined using random amplified polymorphic DNA (RAPD) markers. Two additional species within the S. haematobium group, S. haematobium and S. mattheei, were included in the study. DNA was extracted from four male and four female worms of each species and… 
A phylogeny based on three mitochondrial genes supports the division of Schistosoma intercalatum into two separate species
Preliminary phylogenetic analysis of the mitochondrial data demonstrates a clear dichotomy between the 2 purported strains of Schistosoma intercalatum and it is proposed that they should be treated as distinct taxa.
Recent studies on Schistosoma intercalatum: taxonomic status, puzzling distribution and transmission foci revisited.
The competitive sexual processes acting among human schistosomes show that S. haematobium and S. mansoni are always competitively dominant over S. intercalatum, and three kinds of transmission foci are distinguished, which may help to facilitate the spread of this strain.
Interactions between Schistosoma intercalatum (Zaire strain) and S. mansoni
Mating competition between these species and the ability of males of both species to effect a change of mate by pulling paired females away from their partners was indicated, suggesting that S. mansoni is competitively dominant to S.intercalatum in sequential infections but to a lesser extent than for S. intercalatum (Lower Guinea).
Experimental evidence of hybrid breakdown between the two geographical strains of Schistosoma intercalatum
The sterility of the F4 hybrid sporocyst supports the concept of the existence of 2 distinct taxa, and there is a post-zygotic barrier in the crosses of S.intercalatum Zaire and S. intercalatum Cameroon from the F2 generations onwards.
Interactions between intermediate snail hosts of the genus Bulinus and schistosomes of the Schistosoma haematobium group
Biological factors central to the transmission of schistosomes, including cercarial emergence rhythms and interactions with other parasites and abiotic factors including temperature, rainfall, water velocity, desiccation and salinity are shown to impact on the intermediate host-parasite relationship.
Molecular Identification of Schistosoma mattheei from Feces of Kinda (Papio cynocephalus kindae) and Grayfoot Baboons (Papio ursinus griseipes) in Zambia
This is the first molecular identification of S. mattheei from free-ranging baboons in Zambia and it may affect other wildlife species and humans that live in close proximity to baboons.
Mating interactions of Schistosomes: Biological and epidemiological consequences
The formation of mating pairs by males and females of Schistosoma spp. in the liver or hepatic portal system of their definitive host is a requirement for male and female growth and sexual
Liver disease due to schistosoma guineensis: a review
The authors suggest that a combination of the new antischistosomal drug RO15-5458 and Praziquantel on different strains of Schistosoma mansoni infected mice should be used for treatment of schistosomiasis.
Schistosomiasis with a Focus on Africa
There is a need to evaluate the present status of African schistosomiasis, primarily caused by Schistosoma mansoni and S. haematobium, and the factors affecting the disease as the basis for developing more effective control and elimination strategies in the future.


Epidemiological and genetic observations on human schistosomiasis in Kinshasa, Zaire.
Schistosomiasis in the Republic of São Tomé and Principe: characterization of Schistosoma intercalatum.
Enzymes in Schistosoma intercalatum and the relative status of the Lower Guinea and Zaire strains of the parasite.
Schistosomiasis and the Dogon country (Mali)
A previously unknown area of schistosomiasis transmission is reported based on findings from a travelers' clinic in Barcelona and three species of Schistosoma were diagnosed in a cluster of 43 patients who had been swimming in the Bandiagara and Bankas districts of Mali.
African trypanosomiasis and S. intercalatum infection in Equatorial Guinea: comparative epidemiology and feasibility of integrated control.
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    Tropical medicine and parasitology : official organ of Deutsche Tropenmedizinische Gesellschaft and of Deutsche Gesellschaft fur Technische Zusammenarbeit
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This report presents a preliminary assessment of trypanosomiasis and schistosOMiasis in Equatorial Guinea and assesses the feasibility of integration with the activities of different endemic disease control or health programmes.
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A mathematical model for the evolutionary change of restriction sites in mitochondrial DNA is developed and a measure called "nucleotide diversity" is proposed to express the degree of polymorphism in a population at the nucleotide level.
What is Schistosoma intercalatum Fisher, 1934?
An epidemic of schistosomiasis amongst Dutch travellers returning from West Africa
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