A lower mortality rate: fact or artifact?

On June 29, the pandemic hit two milestones in one go: 10,000,000 infections and 500,000 deaths. Just 43 days later, the number of infections had also passed the 20 million mark. But while the positive cases had doubled, the death toll had only risen by 47%. Are we really looking at a decreasing mortality rate? Or is it merely a matter of more testing?

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