A 10-year-old boy and his mother have been rescued 52 hours after being trapped in the collapse of a virus quarantine site in southeastern China where 20 people have died.

Video released by rescuers showed the two being pulled from the debris of the hotel that collapsed on Saturday. The woman and boy were discovered late Monday night and they were freed around midnight after three hours of painstaking digging.

The hotel in the city of Quanzhou had been a quarantine site for people exposed to the new coronavirus, which for most people causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.