We each got word yesterday that the mixed vaccine trial we are in is going to be unblinded for all participants next week so we will soon know what our 2nd dose was. The letter said they were ending the trial a few months early to allow everyone to have a booster when offered it. They asked us one last favour, to book a blood test with them before we have our booster so that our data will be included in the trial data analysis which will now be over 7 months instead of the original 10 months target for the study. We are happy to do so and have booked our final blood test for November 9th. We could not have a booster before end of October anyway so no big deal (boosters are offered at least 6 months after 2nd jab).
We are excited to hear which vaccine we had. If it was Moderna or Novavax then a Pfizer booster would mean us having 3 different vaccines this year as our first jab was AstraZeneca. One thing that is already clear from this trial is that there are no bad side effects in mixing AstraZeneca, Novavax, Moderna and Pfizer. The other main aim of the trial is to discover if the levels of immunity last longer over time, and I don't know if 7 months is going to be long enough for the results to be statistically significant