Billionaire tech entrepreneur Elon Musk says the COVID-19 pandemic is a "test run" for future, deadlier viruses.
Musk appeared on comedian Joe Rogan's podcast Thursday, describing the current outbreak as "kind of like a practice run" for a future pandemic with "a really high mortality rate" - such as one that kills large numbers of "young, healthy people".
The World Health Organization lists the COVID-19 mortality rate at 3.4% and says "more and more" young people are experiencing severe infections.