A team of Chinese researchers looked at influenza viruses found in pigs from 2011 to 2018 and found a “G4” strain of H1N1 that has “all the essential hallmarks of a candidate pandemic virus,” according to the paper, published by the U.S. journal, Proceedings of the National Academy of Sciences (PNAS).

Pig farm workers also 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.”

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

The coronavirus that caused the worldwide 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.

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.

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Source – https://globalnews.ca/

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