Original Articles
Vol. 2 No. 1 (2007)
https://doi.org/10.4081/gh.2007.258

Multivariate spatially-structured variability of ovine helminth infections

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Received: 23 December 2014
Published: 1 November 2007
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disease mapping, shared component models, hierarchical Bayesian model, veterinary epidemiology, helminths.

Authors

Annibale Biggeri
Department of Statistics G. Parenti, University of Florence, Florence; Biostatistics Unit, CSPO, Florence, Italy.
Dolores Catelan
catelan@ds.unifi.it
Department of Statistics G. Parenti, University of Florence, Florence; Biostatistics Unit, CSPO, Florence, Italy.
Emanuela Dreassi
Department of Statistics G. Parenti, University of Florence, Florence, Italy.
Laura Rinaldi
Department of Statistics G. Parenti, University of Florence, Florence, Italy.
Vincenzo Musella
Department of Pathology and Animal Health, University of Naples Federico II, CREMOPAR Regione Campania, Naples, Italy.
Vincenzo Veneziano
Department of Pathology and Animal Health, University of Naples Federico II, CREMOPAR Regione Campania, Naples, Italy.
Giuseppe Cringoli
Department of Pathology and Animal Health, University of Naples Federico II, CREMOPAR Regione Campania, Naples, Italy.
A cross-sectional survey was carried out on 2004-2005 in the Campania region, southern Italy, to study the multivariate geographical distribution of four different sheep helminths, i.e. Fasciola hepatica (liver fluke), Calicophoron (Paramphistomum) daubneyi (rumen fluke), Dicrocoelium dendriticum (lancet fluke), and the gastrointestinal strongyle Haemonchus contortus. A series of multivariate Bayesian hierarchical models based on square root transformation of faecal egg counts were performed. The results were consistent with theoretical knowledge of the biology and epidemiology of the four studied helminths. In particular, the impact of common intermediate hosts (F. hepatica and C. daubneyi share the same intermediate host species) was quantified and evidence of previously unknown ecological components was given. D. dendriticum was correlated to F. hepatica and H. contortus was found not to be spatially associated with the previously mentioned helminths.

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Multivariate spatially-structured variability of ovine helminth infections. (2007). Geospatial Health, 2(1), 97-104. https://doi.org/10.4081/gh.2007.258

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