When pigs on the Xinda Husbandry Co. Ltd breeding farm in northern China began dying in growing numbers in early January, it looked increasingly likely that the farm had been struck by the much feared African swine fever, an incurable disease that has spread rapidly across the country since last year.But after taking samples from some pigs, local officials in the Xushui district of Baoding city, about an hour’s drive from Beijing, said their tests came back negative, said Sun Dawu, chairman of Hebei Dawu Agriculture Group, the farm owner.As hundreds of pigs began dying daily on the 20,000-head farm, the company obtained a test kit that showed some positive results for the virus. But after further lobbying by Xinda, officials just offered the company subsidies for farm buildings and other investments, said Sun.