I had an AstraZeneca shot on July 23, 2021. I am scheduled to get a second AstraZeneca shot on October 15, 2021. Since I am booked to have AstraZeneca, am I ineligible to get Pfizer as a second shot? The prime minister of Canada and chancellor of Germany both had AstraZeneca first shots followed by mRNA seconds shots of vaccine. I assume they had good medical advice to mix the vaccines after getting the first AstraZeneca shot. Anyone have any idea who I can contact to see if having a first AstraZeneca prior to October precludes you from get a Pfizer second shot. I will reach out to Bumrungrad Hospital, where I got my first shot, to see if I can get the Pfizer as a second shot. Twice they have advised me I am ineligible for Pfizer second shot and must take AstraZeneca. I hope this new news on mixing AZ and Pfizer will allow them to give me the Pfizer as a second shot. My research on the internet leads me to believe that the mixing of vaccines gives a superior protection over two doses of AstraZeneca. I have another 6 weeks to see if there are any more studies on the AZ and Pfizer mixing of vaccines and their benefits and downsides.