Vietnam begins human trials of Covid-19 vaccine. Human trials of Nanocovax, the first Vietnamese Covid-19 vaccine, began on Thursday morning with the first three volunteers getting shots of it. A A man is about to be injected with Nanocovax, the first made-in-Vietnam Covid-19 vaccine in Hanoi, December 17, 2020. Photo by VnExpress/Dinh Van. Two men…