Can the secret contact be isolated in the hotel for three days during the 5+3 isolation period?

Of course. According to the relevant information of the epidemic prevention and control center, known close contacts can also be isolated in the hotel for three days within 5+3 isolation. Close contacts can go back after 5 days of isolation. If there is no place to go and there is no isolation condition at home, you can continue to isolate at the isolation point and go home directly after 5+3.