Pfizer says its COVID-19 vaccine might not need to be kept at ultra-low temperatures, and is asking the U.S. Food and Drug Administration to allow its shots to be stored at temperatures found in common pharmaceutical freezers. If approved, the change could greatly ease distribution of the vaccine.

Meanwhile, Cuba is approaching the final testing phase for its own vaccine, Soberana 2, or Sovereign 2. Cuba has said it may offer the vaccine to tourists once it is approved.