This is what the head of WHO said on Feb 4, 2020.

I think Tedros Adhanom thought CoronaVirus outbreak was contained in Wuhan, China. But praising China's effort and not warning the rest of theowrld at this point should not have been be The WHO.

I don't think even if he warned the world about Coronavirus back then could have prevented the pandemic, but if there was a warning few less people may have been dead from Coronavirus. For that WHO is responsible.