expert reaction to Pfizer and BioNTech reporting interim results from phase 3 COVID-19 vaccine trial
“One can foresee at least two drawbacks to the Pfizer vaccine, even assuming it works as well as we currently think.
First, it requires two injections for full effectiveness, spaced 3 to 4 weeks apart.
Second, it needs to be stored at -80 degrees before use. Both properties will severely complicate administering the vaccine to many recipients, particularly in countries which are warm and have less developed cold chains. There is therefore every reason to continue the search for novel vaccines particularly those requiring only one dose which can be distributed in powder form and reconstituted prior to use.”