How deadly is the new coronavirus (COVID-19) ?

Even if you’re careful to compare the same type of fatality rate across countries, it’s easy to see how testing more, or fewer, people would change the results. In fact, the lack of widespread, systematic testing in most countries is the main source of discrepancies in death rates internationally, says Dietrich Rothenbacher, director of the Institute of Epidemiology and Medical Biometry at the University of Ulm in Germany.