Some countries are, there were e.g. random tests in Germany and Austria to study the general prevalence of Covid-19. There are other ways to cleverly increase

Some countries are, there were e.g. random tests in Germany and Austria to study the general prevalence of Covid-19. There are other ways to cleverly increase test capacities for "explorative" testing by e.g. combining samples from individuals, testing them as a whole and performing binary search on the positive results. Germany plans to roll out antibody tests in May to find out who is already immune, building up the test capacity for that seems to be a complicated process though.