Ii thought pfizer, moderna etc required -70C ... Ie Dry Ice levels.
With strict controls on excursions.
I'd call Liquid Nitrogen cryogenic.
Yes. Strictly speaking it is not cryogenic. The term has been used in the press, I guess to distinguish between that and ordinary refrigeration. Dry ice will reportedly work. Special shipping crates are being designed and manufactured that have dry ice in them, and that will keep the powder vaccine material safe for several days if they are not opened.
This can dealt with in wealthy first world countries, but it may be a challenge in Third World countries. We must meet that challenge. We have to vaccinate the whole human population everywhere -- or at least ~70% of it, or the virus will remain in the human population, and it will keep invading the wealthy countries. This will be particularly important if the vaccine wears off after a year or two.
As I mentioned, the clinician at CVS told me the Pfizer vaccine will be a powder, which they mix with a liquid. She said the older shingles vaccine was also a powder. She told me that right before administering the newer shingles vaccine to me, which knocked me off my feet with a 103 deg F fever and a terrible headache for 24 hours. Nothing to worry about! It clears up at 23 hours 59 minutes. It did that last time too! (This was the final dose, thank goodness.) I hope the COVID vaccine does not do that, or people will not take it.