Three-quarters of eligible Americans have received at least one dose of a Covid-19 vaccine and some are now able to receive an additional booster shot. But the virus still poses a great threat to more than 70 million people who remain unvaccinated.
원문출처 : https://www.cnn.com/2021/09/25/health/us-coronavirus-saturday/index.html
원문출처 : https://www.cnn.com/2021/09/25/health/us-coronavirus-saturday/index.html