Here’s what you need to know about Johnson & Johnson’s single-dose COVID vaccine, which experts call ‘very promising’.
:format(png):focal(2760x1265:2770x1255)/cloudfront-us-east-1.images.arcpublishing.com/gfrmedia/5QVZEHGXX5HMDJATNRUX2CJTJI.jpg "Experts on what to look for in Puerto Rico to return prescient classes")
