Several weeks ago China deployed an ‘anal swab’ test to detect Covid-19, believing it to be more accurate than other testing methods. Passengers in several Chinese airports are now being subjected to these tests, where authorities “insert[..] a cotton-tipped stick three to five centimeters (one to two inches) into the rectum.”
Now China is using this for passengers from ‘high risk countries’ and when multiple people test positive on a flight.