Covid-19 investigation: WHO 'disappointed' as China denies entry to researchers

China said Wednesday it was still negotiating with the World Health Organization the dates and itinerary for a visit by international experts looking into origins of COVID-19, after the head of the agency criticized Beijing for not finalizing permissions for the mission. The Chinese government has been strictly controlling all research at home into the origins of the virus and state-owned media have played up reports that suggest the virus could have originated elsewhere.