On Dec 23, 2020, the government of Singapore announced that Singapore vaccines from Moderna, Pfizer-BioNTech and Sinovac Biotech have been purchased. The Pfizer-BioNTech vaccine needs to be stored at temperatures of minus-70 degrees Celsius (–70°C), which cannot be attained by ordinary freezers. Moderna’s vaccine is a little less demanding and can be stored in freezers of –20°C.

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