• CDC again updates guidance to say Covid-19 can spread by airborne transmission
원문출처 : https://www.cnn.com/2020/10/05/europe/ursula-von-der-leyen-self-isolates-intl/index.html
원문출처 : https://www.cnn.com/2020/10/05/europe/ursula-von-der-leyen-self-isolates-intl/index.html