Johnson & Johnson’s Covid-19 vaccine results extremely encouraging – experts

The single-shot vaccine – developed by Johnson & Johnson’s pharmaceutical arm Janssen – is 66% effective (Jane Barlow/PA)

The trial results of Johnson & Johnson’s Covid-19 vaccine are “extremely encouraging” and suggest that a single dose can be effective, experts have said.

The single-shot vaccine – developed by Johnson & Johnson’s pharmaceutical arm Janssen – is 66% effective overall at preventing moderate to severe coronavirus 28 days after vaccination, results show.