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Multivariate spatially-structured variability of ovine helminth infections
oleh: Annibale Biggeri, Dolores Catelan, Emanuela Dreassi, Laura Rinaldi, Vincenzo Musella, Vincenzo Veneziano, Giuseppe Cringoli
Format: | Article |
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Diterbitkan: | PAGEPress Publications 2007-11-01 |
Deskripsi
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. <em>Fasciola hepatica</em> (liver fluke), <em>Calicophoron</em> (<em>Paramphistomum</em>) <em>daubneyi</em> (rumen fluke), <em>Dicrocoelium dendriticum</em> (lancet fluke), and the gastrointestinal strongyle <em>Haemonchus contortus</em>. 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 (<em>F. hepatica</em> and <em>C. daubneyi</em> share the same intermediate host species) was quantified and evidence of previously unknown ecological components was given. <em>D. dendriticum</em> was correlated to <em>F. hepatica</em> and <em>H. contortus</em> was found not to be spatially associated with the previously mentioned helminths.