A team of Stanford doctors is trying to create a single-dose coronavirus vaccine.
Dr. Peter Kim says there's another benefit to the vaccine only requiring one shot. He says it would also not need to be stored at extremely cold temperatures like the Pfizer vaccine. Kim says this new version of the vaccine would be easier to ship and store in lower-income countries that don't have access to ultra-cold freezers. The Pfizer and Moderna vaccines require two doses, taken three to four weeks apart, in order to remain effective.