Covid-19 metrics for a fast moving target

What is the real number of people infected with Covid-19 in Japan? Or of any country, for that matter? “Testing, testing, testing!” most people say. “Without more testing, we don’t believe the numbers.” As of Apr 21 Japan had conducted 124,550 tests or 1 test per 1,000 people.  How does that compare with peer countries?  Comparing testing […]