WHO says the 'hypothesis' behind China's new outbreak needs further testing

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.Mike Ryan, head of the WHO's emergencies program, said in a briefing that he