With demand for Covid-19 vaccines falling off, mass vaccination sites around the country find themselves facing a dilemma of how to deliver vaccines without wasting precious doses.
원문출처 : https://www.cnn.com/2021/04/29/health/pfizer-moderna-shipment-vials/index.html
원문출처 : https://www.cnn.com/2021/04/29/health/pfizer-moderna-shipment-vials/index.html