As the need for widespread Covid-19 testing grows, officials are looking to flush out hidden cases of the virus by examining sewage.
원문출처 : https://www.cnn.com/2020/04/26/us/covid-19-sewage-testing/index.html
원문출처 : https://www.cnn.com/2020/04/26/us/covid-19-sewage-testing/index.html