COVID-19 <%eb%85%b8%ec%8a%a4%ec%9b%a8%ec%8a%a4%ed%84%b4 class="post-title"> U.S. CDC acknowledges airborne transmission of COVID-19 %eb%85%b8%ec%8a%a4%ec%9b%a8%ec%8a%a4%ed%84%b4> October 6, 2020