Key result
Hunting control measures linked to classical swine fever positivity dropping to 0% over one year.
Why the study?
An outbreak of classical swine fever in wild boar in Switzerland required investigation of epidemiology and control measures in infected and surrounding areas.
Do zoning and targeted hunting strategies control classical swine fever outbreaks in wild boar?
Observational (n=1,294)
Do zoning and targeted hunting strategies control classical swine fever outbreaks in wild boar?
Control measures including zoning and targeted hunting successfully eliminated classical swine fever virus in a wild boar population over one year.
Zoning and targeted hunting were associated with CSF elimination in wild boar; leaves open generalizability to other regions or diseases.
An outbreak of classical swine fever in wild boar in the southern part of Switzerland (Canton of Ticino) was investigated after the implementation of control measures in a defined infected area (the risk zone), and in a surrounding surveillance zone (the non-risk zone). After the disease had been detected, hunting was not allowed in the risk zone for over six months, during which the disease was left to run its course, but hunting was continued in the non-risk zone for one month. After seven months, a hunting strategy targeted at young animals was implemented in both zones. Between May 1998 and January 2000,1294 wild boar were shot or found dead, and diagnostic and biological data were collected and analysed. Only one animal from the non-risk zone was found to be seropositive for antibodies to the virus, whereas 179 of 528 wild boar from the risk zone were virus positive and 162 were seropositive. The proportion of virus-positive animals decreased from 62.7 per cent to zero over one year. During the first hunting season, seropositive animals were found in all age groups, but 12 months later only animals more than one year old had antibodies against the virus.
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Schnyder et al. (2002) conducted an observational in Classical swine fever (n=1,294). Risk zone (infected area) vs. Non-risk zone (surveillance zone) was evaluated on Virus positivity and seropositivity for classical swine fever. In the risk zone, 179 of 528 wild boar were virus positive for classical swine fever, with the proportion of virus-positive animals decreasing from 62.7% to zero over one year.
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