Pfizer and Moderna are testing their coronavirus vaccines to see if they work against the new mutated version of the virus that's recently been found in the United Kingdom and other countries, according to company statements.
원문출처 : https://www.cnn.com/2020/12/22/health/us-coronavirus-tuesday/index.html
원문출처 : https://www.cnn.com/2020/12/22/health/us-coronavirus-tuesday/index.html