Anal swab tests carried out on patients to minimize risks of COVID19 relapse after recovery:

 

https://www.youtube.com/watch?v=_eArZvf1egI

 https://archive.is/qpnNn

 https://sputniknews.com/society/20

 https://nypost.com/2021/01/26/china-using-anal-swabs-to-detect-covid-19-report/

 https://www.ladbible.com/news/weird-china-is-using-anal-swabs-to-test-the-public-for-coronavirus-20210127

https://shore-215.blogspot.com/2021/01/and-you-thought-nasal-swabs-were.html