The origins of a new cluster of coronavirus infections in Beijing are uncertain, World Health Organization officials said on Monday, but the claim that it might have been caused by imports or packaging of salmon was not the "primary hypothesis". Several districts of the Chinese capital put up security checkpoints, closed schools and ordered people to be tested for the coronavirus on Monday after an unexpected rise in cases linked to the biggest wholesale food market in Asia. State-run newspapers reported that the virus was discovered on chopping boards used for imported salmon at Beijing's Xinfadi market amid worries about a second wave of the pandemic in China.
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