The reason Biontech did not do that earlier was because the tests to analyze the effect of temperature take months to do, 2 to 3 months. So they started vaccin

The reason Biontech did not do that earlier was because the tests to analyze the effect of temperature take months to do, 2 to 3 months. So they started vaccinating people without delaying it 3 months because it was an emergency. But after 3 months of testing we will be able to know how temperature storage affects the vaccine.