COVID-19: Johnson & Johnson's single-shot vaccine 85% effective against most severe symptoms

A single-shot vaccine developed by the healthcare giant Johnson & Johnson is effective in preventing the most serious coronavirus symptoms, according to data from mass trials.

The company said its latest tests - carried out in several countries - also showed it was 66% effective overall at preventing moderate to severe COVID-19, 28 days after vaccination.

It comes as another coronavirus vaccine from Novavax could get the all-clear from UK regulators.

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