Second Doses of Covid Vaccine Explanation - Difference between Pfizer and Astra Zeneca Posted or Updated on 26 May 2022

Timing of second doses (difference of Oxford AstraZeneca & Pfizer)

The Mass Vaccination Programme has started the rollout of Pfizer second doses, where supply is adequate we are looking to bring the interval forward from 11-12 weeks. We are aiming to administer the Pfizer second doses to all those who received their first vaccine between December 7th and February 21 st by the end of March.

For those who received the Oxford AstraZeneca vaccine - the dose interval showing the highest efficacy is 12+ weeks and will be used unless there are individual clinical reasons to use a shorter interval. The programme will commence the rollout of second dose AstraZeneca appointments from March 29th.