Second US study for COVID-19 vaccine uses skin-deep shots

US researchers have opened another safety test of an experimental COVID-19 vaccine, this one using a skin-deep shot instead of the usual deeper jab. The pinch should feel like a simple skin test, a researcher told the volunteer lying on an exam table in Kansas City, Missouri, on Wednesday. "It's the most important trial that we've ever done," Dr John Ervin of the Center for