Covid numbers remain low inside Beijing’s ‘closed loop.’

Eleven of 142 people arriving in Beijing on Sunday tested positive for the coronavirus, including seven athletes and team officials, Olympic officials said.

The numbers were in line with what has settled into a consistent trend in the run-up to the Games and the first week of competition: A relatively small number of Olympic-related arrivals have tested positive and been forced to isolate, with no nightmare-scenario outbreak as of yet.

Athletes and other attendees inside Beijing’s “closed loop,” a set of designated venues and hotels that visitors cannot leave to try to keep the virus from spreading, are required to undergo a polymerase chain reaction, or P.C.R., test every day. Of the 74,603 tests taken in the closed loop on Sunday, 13 people tested positive, including five athletes and team officials.

Arrivals are tested at the airport and then isolate in hotel rooms until the results come back a few hours later. Those who test negative are allowed to move freely throughout the Games’ closed loop. Those who test positive but do not require medical treatment must isolate in hotel rooms. They are allowed to return to action only after registering two negative tests.