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okr said:
It wasn't developed by Pfizer, they just finance (together with the German government), manufacture and distribute. The vaccine was developed by Biontech located in Mainz, Germany.

The only issue with this vaccine is for it to not go bad, it needs to be kept around -70 degree celcius.
Needing to be kept cold, to this degree actually makes distribution and handling alot more difficult.
If the plan is to vaccinate 100's of millions of people, the logistics of such a thing are a issue.