The CDC in the statement said that isolation and quarantine time has been reduced based on the findings that SARS-CoV-2 is more transmitted in the early course of illness. An infected person shreds the virus in the first 2-3 days of the infection. So, it is crucial to be isolated these days. After that period, they are less likely to infect others and are not required to isolate and quarantine. However, it is necessary to be cautious, so wearing a mask is necessary.