Validation of an interactive map assessing the potential spread of Galba truncatula as intermediate host of Fasciola hepatica in Switzerland

  • Rhea Baggenstos Department of Farm Animals, University of Zurich, Zurich, Switzerland.
  • Tobias Dahinden Institute of Cartography and Geoinformatics, Leibniz University Hannover, Hannover, Germany.
  • Paul R. Torgerson Section of Veterinary Epidemiology, University of Zürich, Zürich, Switzerland.
  • Hansruedi Bär Institute of Cartography and Geoinformation, Swiss Federal Institute of Technology in Zurich, Zurich, Switzerland.
  • Christina Rapsch Department of Farm Animals, University of Zurich, Zurich, Switzerland.
  • Gabriela Knubben-Schweizer | g.knubben@lmu.de Department of Farm Animals, University of Zurich, Zurich, Switzerland; Clinic for Ruminants with Ambulatory and Herd Health Services, Ludwig-Maximilians-University Munich, Oberschleissheim, Germany.

Abstract

Bovine fasciolosis, caused by Fasciola hepatica, is widespread in Switzerland. The risk regions were modelled in 2008 by an interactive map, showing the monthly potential risk of transmission of F. hepatica in Switzerland. As this map is based on a mathematical model, the aim of the present study was to evaluate the interactive map by means of a field survey taking different data sources into account. It was found that the interactive map has a sensitivity of 40.7-88.9%, a specificity of 11.4-18.8%, a positive predictive value of 26.7-51.4%, and a negative predictive value of 13.1-83.6%, depending on the source of the data. In conclusion, the grid of the interactive map (100 x 100 m) does not reflect enough detail and the underlying model of the interactive map is lacking transmission data.

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Published
2016-05-31
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Original Articles
Keywords:
Fasciola hepatica, Galba truncatula, Risk modelling, Interactive map, Switzerland
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How to Cite
Baggenstos, R., Dahinden, T., Torgerson, P. R., Bär, H., Rapsch, C., & Knubben-Schweizer, G. (2016). Validation of an interactive map assessing the potential spread of Galba truncatula as intermediate host of Fasciola hepatica in Switzerland. Geospatial Health, 11(2). https://doi.org/10.4081/gh.2016.418