Goat as a risk factor for sheep infection

1. INVESAGA - USC
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XVIII Congreso de la Sociedad
Española de Parasitología
The goat as a risk factor for parasitic infections in
ovine flocks
López, C.M., Panadero, R., Díaz, P., Pérez, A., Cabanelas,
E., Díez-Baños, P., Morrondo, P.

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Sheep-goat contact
● 30% flocks
● Risk factor?
● VM (Lago et al., 2012)
● Protostrongilidae (López et al., 2011)
INTRODUCTION

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MATERIAL AND METHODS
Sheep-goat contact
● 74 flocks
● 2,093 sheep
– 468 mixed manage with goats
– 1,625 manage without goats
● Flotation, sedimentation and migration
● R - cc() function – epicalc package

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RESULTS
● Protostrongylidae
χ2= 21.690; P<0,001
goats
Prot. no yes total
neg 1466 385 1851
pos 159 83 242
total 1625 468 2093

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RESULTS
● Gastrointestinal
nematodes
χ2= 24.910; P<0,001
goats
GI no yes total
neg 582 99 681
pos 933 300 1233
total 1515 399 1914

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RESULTS
● Dictyocaulus filaria
χ2= 12.312; P<0,001
goats
D.filaria no yes total
neg 1473 397 1870
pos 152 71 223
total 1625 468 2093

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RESULTS
● Eimeria spp
χ2= 12.312; P<0,001
goats
Eimeria no yes total
neg 422 77 681
pos 1093 322 1233
total 1515 399 1914

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RESULTS
No association
● Fasciola hepatica (104 positive; OR 1.01)
● Dicrocoelium (14 positive)
● Paramphistomidae (12 positive)
● Moniezia (96 positive; OR 1.02)

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IN FACT ...
● Association ≠ causality
– Biological explanation
● Confouding variable
– Multivariate analysis
● but...

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CONCLUSION
Mixed management sheep-goat must be
introduced as a risk factor in statistical
analysis in sheep infection studies

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THANKS
Supported by the research project PGIDIT06RAG26101PR
and a grant for Consolidating and Structuring Competitive
Research Groups (Xunta de Galicia CN2012/326)
References:
López et al. (2011). Vet. Parasitol. 178, 108-114.
Lago et al. (2012). Prev.Vet.Med. 103, 163-169.

12. INVESAGA - USC
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XVIII Congreso de la Sociedad
Española de Parasitología
The goat as a risk factor for parasitic infections in
ovine flocks
López, C.M., Panadero, R., Díaz, P., Pérez, A., Cabanelas,
E., Díez-Baños, P., Morrondo, P.