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Schistosomiasis then and now: what has changed in the last 100 years?

Published online by Cambridge University Press:  22 January 2020

R. Alan Wilson Open the ORCID record for R. Alan Wilson [Opens in a new window]
R. Alan Wilson*
Affiliation:
Centre for Immunology and Infection, Department of Biology, University of York, YorkYO10 5DD, UK
*
Author for correspondence: R. Alan Wilson, E-mail: alan.wilson@york.ac.uk
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Abstract

Only with the completion of the life cycles of Fasciola hepatica in 1883 and 30 years later those of Schistosoma japonicum (1913), Schistosoma haematobium and Schistosoma mansoni (1915) did research on schistosomiasis really get underway. One of the first papers by Cawston in 1918, describing attempts to establish the means of transmission of S. haematobium in Natal, South Africa, forms the historical perspective against which to judge where we are now. Molecular biology techniques have produced a much better definition of the complexity of the schistosome species and their snail hosts, but also revealed the extent of hybridization between human and animal schistosomes that may impact on parasite adaptability. While diagnostics have greatly improved, the ability to detect single worm pair infections routinely, still falls short of its goal. The introduction of praziquantel ~1982 has revolutionized the treatment of infected individuals and led directly to the mass drug administration programmes. In turn, the severe pathological consequences of high worm burdens have been minimized, and for S. haematobium infections the incidence of associated squamous cell carcinoma has been reduced. In comparison, the development of effective vaccines has yet to come to fruition. The elimination of schistosomiasis japonica from Japan shows what is possible, using multiple lines of approach, but the clear and present danger is that the whole edifice of schistosome control is balanced on the monotherapy of praziquantel, and the development of drug resistance could topple that.

Keywords

Bladder cancerchemotherapydiagnosiseliminationmass drug administrationmolluscan hostpathogenesispathologySchistosome speciesvaccine
Type
Review Article
Information
Parasitology , Volume 147 , Issue 5 , April 2020 , pp. 507 - 515
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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