China’s Agriculture Ministry (MOA) announced on November 21 that four cases of H1N1 tested positive in a hog slaughterhouse in North China’s Heilongjiang province, reported by Beijing's China News Service (CNS).

The H1N1 flu found in the cases is suspected to have been transferred from humans during the transportation or slaughtering process, according to CNS.

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In order to avoid H1N1 outbreaks, MOA has inspected 87 million heads of live pigs since this autumn, and no cases have been found in pig farms, said the report.