China is implementing an H1N1 vaccination program for farm and slaughterhouse workers after the University of Hong Kong identified the virus in five samples from pigs, according to Food Safety News.

The samples were taken from pigs that had been sent to a Hong Kong slaughterhouse from mainland China. Hong Kong's Food and Environmental Hygiene Department said that the pigs probably caught the virus from humans.

The hygiene department said that workers should wear masks and other protective clothing when handling pigs. A spokesman said that the public should not fear H1N1 in pork products because slaughtered swine are inspected before going to market.