The US government is pouring billions into Covid-19 vaccines, and candidates from three companies are moving along quickly: Moderna, Pfizer and Novavax.
원문출처 : https://www.cnn.com/2020/08/06/health/covid-19-vaccines-explainer/index.html
원문출처 : https://www.cnn.com/2020/08/06/health/covid-19-vaccines-explainer/index.html