As I understand, the Pfizer vaccine requires super-cold refrigeration, Moderna’s can be stored in medical refrigerator temps, but AstraZenica’s can be kept in standard refrigeration systems. Possibly even a run of the mill ice chest.
If hat gives AZ’s vaccine a significant advantage in portability to rural areas. Some counties here in Texas don’t have a single MD, and the nearest medical facilities are over 250 miles away.
Now imagine trying to vaccinate people outside of first-world nations.
Ultimately, that could make it the most important of the three for fighting the pandemic globally.
There's a town in Texas up near Oklahoma and it's 800 miles from anywhere iirc. Saw a video about vaccine logistics. Might be 800 miles from Houston or Dallas.