According to the US Centers for Disease Control and Prevention, people who have a positive Covid test should stay home for at least five days and isolate from others.

Source: https://krdo.com/sports/cnn-sports/2023/08/29/espn-tennis-analyst-john-mcenroe-will-miss-some-of-us-open-after-positive-covid-19-test/

Anyone who takes a Covid test must pay for it themselves.

Source: https://www.swissinfo.ch/eng/politics/switzerland-in-2023--new-year--new-laws/48164346?utm_campaign=swi-rss&utm_source=multiple&utm_medium=rss&utm_content=o

Passengers traveling to France from China must present a negative Covid test before boarding flights.

Source: https://businessmirror.com.ph/2023/01/01/more-countries-tighten-covid-measures-for-china-travelers/