e-ISSN 1828-1427 |
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Rivista trimestrale di Sanità
Pubblica Veterinaria edita dall'Istituto Zooprofilattico Sperimentale
dell'Abruzzo e del Molise G.
Caporale'
A quarterly journal devoted to veterinary public health, veterinary science and medicine published by the Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise ‘G. Caporale’ in Teramo, Italy |
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ISSUES ONLINE
2007
- Volume 43 (3)
July-September |
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Vanessa
Racloz, Patrick Presi, Penelope Vounatsou, Heinzpeter Schwermer, Simona
Casati, Tullio Vanzetti, Christian Griot & Katarina D.C.
Stark |
Use
of mapping and statistical modelling for the prediction of bluetongue
occurrence in Switzerland based on vector biology |
513-518 |
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Summary
Due
to the spread of bluetongue (BT) in Europe in the last decade, a sentinel
surveillance programme was initiated for Switzerland in 2003, consisting
of serological sampling of sentinel cattle tested for BT virus antibodies,
as well as entomological trapping of Culicoides midges from
June until October. The aim of this study was to create a suitability
map of Switzerland, indicating areas of potential disease occurrence
based on the biological parameters of Obsoletus Complex habitat. Data
on Culicoides catches from insect traps together with various
environmental parameters were recorded and analysed. A multiple regression
analysis was performed to determine correlation between the environmental
conditions and vector abundance. Meteorological data were collected
from 50 geo-referenced weather stations across Switzerland and
maps of temperature, precipitation and altitude were created. A range
of values of temperature, precipitation and altitude influencing vector
biology were obtained from the literature. The final combined map
highlighted areas in Switzerland which are most suitable for vector
presence, hence implying a higher probability of disease occurrence
given the presence of susceptible animals. The results confirmed the
need for an early warning system for the surveillance of BT disease
and its vectors in Switzerland.
Keywords
Bluetongue,
Culicoides, Geographic information system, Map, Sentinel
surveillance, Vector biology
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