When a coronavirus vaccine comes on the market, people will likely need two doses, not just one -- and that could cause real problems.
원문출처 : https://www.cnn.com/2020/08/30/health/coronavirus-vaccine-two-doses/index.html
원문출처 : https://www.cnn.com/2020/08/30/health/coronavirus-vaccine-two-doses/index.html