Johnson & Johnson vaccine ‘66% effective against moderate to severe Covid-19’

Johnson & Johnson’s one-dose vaccine seems to protect against Covid-19, but not as well as some two-shot rivals (PA)

Johnson & Johnson’s long-awaited vaccine appears to protect against Covid-19 with just one shot – but not as strong as some two-shot rivals.

J&J said on Friday that in the US and seven other countries, the single-shot vaccine was 66% effective overall at preventing moderate to severe illness, and much more protective – 85% – against the most serious symptoms.