"China is closely following the developments in regard to this matter. We will take all necessary measures to prevent the spread and outbreak of any virus," Chinese Foreign Ministry spokesman Zhao Lijian told a daily news conference on Tuesday.
The PNAS study said pigs were considered important "mixing vessels" for the generation of pandemic influenza viruses and called for "systematic surveillance" of the problem.
China took action against an outbreak of avian H1N1 in 2009, restricting incoming flights from affected countries and putting tens of thousands of people into quarantine.
The new virus identified in the study is a recombination of the 2009 H1N1 variant and a once prevalent strain found in pigs.
But while it is capable of infecting humans, there is no imminent risk of a new pandemic, said Carl Bergstrom, a biologist at the University of Washington.
"There's no evidence that G4 is circulating in humans, despite five years of extensive exposure," he said on Twitter. "That's the key context to keep in mind."
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