Coronavirus: WHO warns of ‘no silver bullet’ amid vaccine search BBC News 4 years ago Progress is being made though, its chief says, as he stresses the importance of preventive steps. Donation Help Support the Work of WNews Donate ADVERTISEMENT ADVERTISEMENTThis post was originally posted on BBC News. Read the rest of the story at https://www.bbc.co.uk/news/world-53643455.This post was originally published on this site