World has 'window of opportunity' to halt virus spread: WHO chief The dramatic measures taken by China to rein in the deadly novel coronavirus outbreak have prevented significant spread abroad, providing a "window of opportunity" to halt transmission, the World Health Organization chief says during a press briefing in Geneva. The UN health agency's chief also calls for greater solidarity, accusing some governments of wealthy countries of being "well behind" in sharing data on virus cases. More than 20,400 cases of the virus have been confirmed in China since the virus was first detected on December 31. The death toll in mainland China has soared to 425 and more than 20 countries have now confirmed cases of the virus, which the WHO has declared a global health emergency. IMAGES AND SOUNDBITES of a speech by Tedros Adhanom Ghebreyesus, WHO Director General at a technical meeting on coronavirus at WHO