KUALA LUMPUR: The Pfizer-BioNTech mRNA vaccine for Covid-19 (pix) requires ultra-cold storage at -70 degrees Celsius (°C) in order to maintain the cold chain delivery for the vaccine to retain its potency when administered.

In comparison, the coldest place on Earth currently is the South Pole in Antarctica, where temperatures are currently sitting around -38°C, while the standard temperature for freezers commonly used in houses is -18°C.