Abstract
The contamination with faeces from dogs and foxes was documented on 14 different grassland areas in the canton of Zurich, Switzerland, over one year. A total of 402 dog and 58 fox faecal samples were collected from the grasslands, further 236 faecal samples were retrieved from Robidog® units (disposal units for dog waste bags) in the immediate vicinity. The degree of fecal contamination per 100 m2 and year was 0.07-0.75 for dog samples and 0-0.06 for fox samples. Dog faeces from Robidog® units and grasslands contained stages of the following parasites, respectively (sedimentation/flotation method): Toxocara sp. (2.5%; 1.2%), Taenia crassiceps (with molecular confirmation; 0.8%; 0.2%), Capillaria sp. (0.4%; 0.7%), Trichuris sp. (0.8%; 1%), Isospora sp. (2.1%; 2%) and Angiostrongylus vasorum (0.4%; 0.5%). In fox faeces parasite stages were more frequently detected: 19% Toxocara sp., 8.6% Taenia crassiceps, 6.9% Echinococcus multilocularis, 60.3% Capillaria sp., 29.3% Trichuris sp. In two fecal samples from foxes, Taenia saginata eggs or Toxoplasmagondii oocysts were confirmed by molecular analyses, these findings may be explained as an intestinal passage after coprophagy of human or cat feces, respectively. Therefore, foxes can also indirectly play a role in parasite transmission to livestock.
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