Posting this in case those with a first AZ jab haven't come across it yet:
AstraZeneca 1st dose, Pfizer 2nd: Study says combination is safe and effective
https://globalnews.ca/news/7871590/m...ca-pfizer/amp/
I am a little surprised to see that mixing mRNA vaccines with AZ is as effective as it seems to be, but it is certainly good and welcomed news.