AstraZeneca says coronavirus vaccine developed with Oxford can be up to 90 per cent effective

AstraZeneca says late-stage trials of its COVID-19 vaccine have been “highly effective” in preventing disease.

Researchers found that if people were given a half dose followed by a full dose of the vaccine, rather than two full doses, about 90 per cent of people were protected.

Where two full doses were given at least one month apart it showed 62 per cent efficacy.

The combined average across different…