Younger people could be given doses of two different Covid vaccines Oxford University begins recruiting for trial to test whether AstraZeneca and Pfizer vaccines can be given as two-dose regime 4 February 2021 • 6:00am Trial results are expected by June, which could allow younger people who receive their jab later in the year to be given two different vaccines Younger people could be given a "mix and match" dose of two different Covid vaccines after Oxford launched a trial to see whether it is safe to give an alternative booster jab in case of supply problems. Oxford University has begun recruiting for a new trial to test whether the AstraZeneca and Pfizer vaccines can be given together as part of a two-dose regime. Results are expected by June, which could allow younger people who receive their jab later in the year to be given two different vaccines.