Experts call for cold chain preparation for vaccination
A medical worker conducts a coronavirus test at a makeshift testing center in front of Seoul Station, Tuesday. YonhapBy Bahk Eun-jiAhead of Korea's planned COVID-19 vaccination program that will start possibly next month, experts said a proper storage and distribution system is required so that vaccines can reach people ready to be used.The government has so far secured vaccine doses for 56 million people from four suppliers ― AstraZeneca, Moderna, Johnson & Johnson's Janssen, and Pfizer ― as well as through COVAX, but multiple steps are required to deliver the glass vials of vaccine to local hospitals and medical institutions as most of them have to be refrigerated at certain temperatures. Among them, Moderna's vaccine has to be shipped at minus 20 degrees Celsius, and it can then be stored at that temperature for six months. Pfizer's vaccine must be kept at minus 70 degrees Celsius, and once unfrozen for administration, it must be administered within five days. Vaccines from AstraZeneca and Johnson & Johnson's Janssen can be stored at a temperature similar to ordinary flu v
