kim. >> salma abdelaziz in london, and ben wedeman in rome. thank you both.reciate it. >>> promising coronavirus vaccine from the drug makers pfizer and biontech is in advance trials and could be available to some in just a few weeks, but the vaccine has to be stored at minus 94 degrees fahrenheit, that's minus 70 degrees celsius to remain effective. distributors must figure out how to transport millions of shots around the world while keeping them viable. cnn's anna stewart reports. >> we have 1.3 billion doses globally next year. >> reporter: millions of doses have been made, ready to go, should the pfizer, biontech vaccine get approval. this poses a major challenge, the storage and transportation of the vaccine. >> we have to keep the product very cold and shipped in in very much sub freezing temperatures, and there will be a short-term of stability perhaps at refrigerated temperatures, and that's going to be a logistical challenge. >> logistics firms like ups, fedex, and deutsch post started planning for this months ago. >> we have about 9,000 health care