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New Virus In Pigs Has Potential Pandemic Risk - Scientists Warn



In China, a new flu virus has been found in pigs which has now become more infectious to humans and needs to be watched closely in case it becomes a potential "pandemic virus", a new study has found.

A team of Chinese researchers looked at influenza viruses found in pigs from 2011 to 2018 and found a ("G4" strain of H1N1) with "all the essential hallmarks of a candidate pandemic virus", according to the paper, which was published in the US journal, Proceedings of the National Academy of Sciences - PNAS.

This is because workers on pig farms showed elevated levels of the virus in their blood, the authors said, adding that "close monitoring in human populations, especially the workers in the swine industry, should be urgently implemented.

"Pigs are intermediate hosts for the generation of pandemic influenza virus. Thus, systematic surveillance of influenza viruses in pigs is a key measure for prewarning the emergence of the next pandemic influenza," the study said.

The peer-reviewed study was authored by academics at the China Agricultural University, Shandong Agricultural University, the Chinese Center for Disease Control and Prevention, the Chinese Academy of Sciences, and the University of Nottingham.

The study highlights the risks of viruses crossing the species barrier into humans, especially in densely populated areas where millions live in close proximity to farms, breeding facilities, slaughterhouses and wet markets.

Meanwhile, the novel coronavirus that caused the COVID-19 pandemic is believed to have originated in horseshoe bats in southwest China, and could have spread to humans via a seafood market in Wuhan, where the virus was first identified.

The PNAS study said pigs are considered important "mixing vessels" for the generation of pandemic influenza viruses and called for "systematic surveillance" of the problem.

However, 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.

A key context to keep in mind is that there's no evidence that G4 is circulating in humans, despite five years of extensive exposure," he said on Twitter after the paper's publication.

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