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An outbreak of trichinellosis in farmed wild boar in Finland

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Nine farmed wild boar out of 25 slaughtered from a single farm were condemned at meat inspection because of trichinellosis. With RAPD-PCR, Trichinella spiralis was identified in all positive wild boar. Out of the available serum samples (n=7), all wild boar which had failed the meat inspection showed seroconversion in ELISA and Western blotting, as did one additional animal which had passed the inspection. The animals became infected during an invasion of rats from an improperly closed dump near the farm. Unfortunately, by the time trichinellosis was discovered in the wild boar, the invasion had already been brought under control; thus, no samples from rats were available. However, having lived through the rat invasion was shown to be a risk factor for trichinellosis in wild boar (relative risk, RR=6.3). In wildlife samples from surrounding areas, sylvatic trichinellosis was found to be very common (74%; n=19 red foxes). Intriguingly, the prevalent species in trichinella-positive foxes differed from that in wild boar, Trichinella nativa and T. spiralis being found in 12 foxes and in one fox, respectively.

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Keywords: Finland; Trichinella; epidemiology; game farms; trichinellosis; wild boar

Document Type: Original Article

Affiliations: 1: National Veterinary and Food Research Institute, Helsinki and 2: Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, University of Helsinki, Finland

Publication date: 2000-12-01

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