Extra Data Shows AstraZeneca Vaccine Efficacy In Elderly: UK Regulators Extra Data Shows AstraZeneca Vaccine Efficacy In Elderly: UK Regulators Britain has been rolling out the shot among all age groups after the Medicines and Healthcare products Regulatory Agency (MHRA) was the first regulator to approve it in December. European countries have said more data is needed before it is given to those over 65. London: British regulators have received extra trial data from AstraZeneca that supports their view that the COVID-19 vaccine developed with Oxford University is effective in the elderly, a vaccines official said on Friday Britain has been rolling out the shot among all age groups after the Medicines and Healthcare products Regulatory Agency (MHRA) was the first regulator to approve it in December, but some other European countries have said more data is needed before it is given to those over 65.