AZ vaccine gives better-than-expected 90% reduction in cases
Robert Cuffe
BBC head of statistics
ReutersCopyright: Reuters
Public Health England has just published real-world data - as opposed to those from clinical trials - suggesting having a second dose of the Oxford-AstraZeneca vaccine lifts its efficacy from about 60% to 90%.
We had already seen data on the effectiveness of the second dose of the Pfizer vaccine, but these are the first to estimate the effects of the second dose of the AZ vaccine.
The study, published by PHE, looked at cases of coronavirus detected in the community among those aged over 65 (the first groups to be vaccinated).
It found that, a fortnight after the first dose of the Pfizer or AZ vaccine, the odds of getting symptomatic Covid fell by nearly 60%, consistent with previous reports.
After a second dose of Pfizer or AZ, cases were about 90% lower than among those who had not been vaccinated.
These results are better than those observed in the clinical trials and those assumed by scientific modellers supporting the most recent unlocking.