Oxford/AstraZeneca planning new trial of lower-dose jab to see how well it works in older people
Concerns around the efficacy of the Oxford University/AstraZeneca coronavirus jab in older people could lead to different age groups being given different vaccines, experts have said.
The partners announced last week that the vaccine had a 70% efficacy overall. For most trial participants – given two full doses, spaced a month apart – the efficacy was 62%, but for 3,000 participants mistakenly given half a dose for their first jab, the efficacy was 90%. No participants, regardless of dosing, developed severe Covid or were hospitalised with the disease.
