Health experts have said that data so far has shown that Covid-19 vaccines prevent symptoms of the virus -- but a new study suggests that the Moderna and Pfizer vaccines may also prevent infections.
원문출처 : https://www.cnn.com/2021/02/20/health/us-coronavirus-saturday/index.html
원문출처 : https://www.cnn.com/2021/02/20/health/us-coronavirus-saturday/index.html