Live polio vaccine must always be kept cold to avoid heat killing the virus. In a standard clinic or hospital refrigerator it should be stored at 2 to 8 °C. Direct sunlight kills the vaccine. Keep the vial of vaccine cool in a home refrigerator or cool bag while it is being used. It can be safely kept in this way for up to 30 days.
Polio vaccine can be stored for years at −20 °C or for one year at −10 °C.