WASHINGTON, United States (AFP) — Frozen vials of Pfizer’s Covid-19 vaccine may be stored at temperatures commonly found in pharmaceutical freezers for a period of up to two weeks, the US Food and Drug Administration said Thursday. The move loosens a previous requirement that the vaccine be stored at ultra-low temperatures, between -112 degrees Fahrenheit and -76 degrees Fahrenheit (-80 degrees Celsius and -60 degrees Celsius). © Agence France-Presse