Coming in third and with lower efficacy rates,Johnson & Johnson’s share of the COVID-19 market will look a little different from the messenger RNA vaccine leaders. But with one-shot dosing and no need for deep freezing, J&J’s Ad26.COV2.S has convenience advantages that will mean it has a bigger role to play in developing nations.
On 27 February, the US Food and Drug Administration granted an emergency use authorization (EUA) for J&J subsidiary Janssen’s single-shot...








