About Covid-19 tests.
In Brazil, we have about four or five different types of tests. Each of them seems to cover one determinate moment of the illness. There is mainly the test, were they take a drop of blood out of oneīs finger to confirm if one has already acquired antibodies against Covid. Then there is the viral test that verifies if there is a current infection.
https://en.wikipedia.org/wiki/COVID-19_testing
https://www.cdc.gov/coronavirus/2019...g/testing.html
Testing here is still irregularly applied. How is it in your countries?