December 31, 2020, local time, the Centers for Disease Control and Prevention concluded in its Weekly Morbidity and Mortality Report that it had shortened the recommended isolation period after exposure to COVID-19 from 14 days to 7 to 10 days in early December, adding “COVID-19 into one The risk of step-by-step transmission”.
The CDC noted that shorter quarantine periods particularly increase the risk of COVID-19 transmission in homes. According to interim data from a study by the Centers for Disease Control and Prevention on the spread of the novel coronavirus in the home, only 24% of people who have been quarantined for seven days after their family members have symptoms of viral infection have not been detected.
And these 24% are still nearly 20% more likely to develop symptoms of COVID-19 within 14 days. Therefore, the U.S. Centers for Disease Control and Prevention said that if a person is isolated for only 7-10 days after exposure to a person infected with COVID-19, there is still a risk of spreading the virus.