pjmedia.com/columns/stacey-lennox/2021/01/20/the-who-finally-updates-its-covid-19-testing-policy-1-hour-after-bidens-inauguration-n1398857
Case definition is different from testing guidance.
Here is the case definition for the United States: https://wwwn.cdc.gov/nndss/conditions/coronavirus-disease-2019-covid-19/case-definition/2020/08/05/